쉐도잉 연습: The 3 best predictors of how well you’ll age - Juulia Jylhävä - YouTube로 영어 말하기 배우기

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The The The The The The The If you want to learn a fish's age,
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The The The The The The The If you want to learn a fish's age,
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simply take one of its scales and count the number of bands radiating from its center.
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For trees, you can count their rings.
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For narwhals, their tusk layers.
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And for blue whales, their layers of earwax.
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When it comes to humans,
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scientists have yet to find any visible traits that mark our age with anywhere near the same specificity.
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But in the past few decades,
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they've discovered small, invisible markers hidden within the body that do change over time.
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And they may hold even more information about our health, history, and future.
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The first of these markers was discovered in the 1990s.
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Telomeres are repetitive sequences at the ends of DNA strands that protect chromosomes from fusing together.
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However, each time a cell divides,
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part of the telomere is cut off.
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These small losses can add up over time,
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and once telomeres get too short,
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cells lose their ability to replicate and eventually die.
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This gradual shrinking process led scientists to identify telomere length as a promising,
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albeit imperfect, marker of aging.
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As technology has advanced, scientists learned how to detect even more discrete changes to DNA,
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like the addition of individual molecular tags called methyl groups.
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This DNA methylation can control gene expression,
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including switching genes on and off.
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It can occur rapidly and frequently,
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allowing cells to respond to different situations and perform normal functions.
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Yet researchers noticed that at certain sites in the genome,
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methylation levels tend to change more gradually and predictably as we age.
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The reason for this is still unknown,
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but these changes may be associated with stress or caused by random errors during DNA replication.
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By measuring DNA methylation patterns from hundreds or thousands of these sites,
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scientists have developed what they call epigenetic clocks as another way to measure aging.
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A third way our bodies change over time is through inflammation.
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Proteins that are important components of the immune system generally increase when we get sick,
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then decrease again once our body has recovered.
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But as we get older,
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their baseline levels rise, resulting in chronic, low-level inflammation.
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This process is called inflammation.
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Scientists are still unsure why it occurs,
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but it could be due to repeated encounters with pathogens and other stresses.
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Another explanation could be the process of cellular senescence.
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When cells get old and stop dividing, they secrete inflammatory proteins.
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And by measuring the level of these proteins,
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scientists have developed yet another clock that can accurately measure aging aging.
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While all three of these markers are great additions to the age estimation toolbox,
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they don't perfectly correlate with chronological age.
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Instead, they're best at estimating something called biological age.
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Biological age is a measure of how well your body is functioning,
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how much damage your cells and organs have accumulated,
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and your overall risk for certain health problems.
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Unlike chronological clocks, biological clocks tick at different rates for for different people due to genetic differences,
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as well as health, stress,
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and many other environmental factors.
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And different tissues and organs within the body may even biologically age at different speeds.
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In many ways, these clocks are still a work in progress.
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For example, most experts recommend against personalized biological age testing.
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While these tests are commercially available,
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the value and accuracy of these measurements remain unclear.
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Currently, these tools work best at the population level,
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when data from many individuals are analysed.
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However, many scientists hope to change this in the future,
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as accurately tracking this information could revolutionise personalised healthcare.
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For example, one day, a person's accelerated biological age might help doctors detect an unknown health condition much earlier.
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And other researchers are searching for ways to slow down or even turn back these biological clocks.
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Though so far, most attempts at this have been largely unsuccessful.
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Besides, researchers still don't know if telomeres,
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inflammation, or epigenetics are actually to blame for aging,
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or if they are simply neutral markers of other processes happening in the body.
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We may be learning to read the language of aging,
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but we still have a way to go in understanding its grammar.
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Do you ever feel like you don't know enough about your own body?
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Subscribe to this channel to learn about everything from baldness to muscle growth to why we have hair in such random places.
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Stay tuned and stay curious.
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you

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비디오에서 사용된 주요 구조들을 분석해보면 다음과 같은 것들이 있습니다:

  • “Scientists have yet to find”: 이 표현은 과학자들이 아직 무엇인가를 발견하지 못했음을 나타냅니다. 'have yet to'는 현재 완료형으로, 미래 관련성을 강조하는 데 유용합니다.
  • “Each time a cell divides”: 'Each time'이라는 표현은 반복적인 상황을 설명할 때 사용됩니다. 이는 조건부 문장을 연습하는 데 도움이 됩니다.
  • “These changes may be associated with stress”: 'may be'는 가능성을 나타내며, 조심스럽게 의견을 제시하는 데 적합한 구조입니다. 이로 인해 상황을 조심스럽게 묘사할 때 도움이 됩니다.

일반적인 발음 함정

비디오에서 주의해야 할 발음의 함정은 'telomeres'와 'methylation'입니다. 이 두 단어는 발음하기가 어려울 수 있으며, 특히 교육적인 맥락에서는 중요합니다. 'telomeres'는 '테로미어스'라고 발음되며, 음절의 억양이 중요합니다. 또한, 'methylation'의 경우 '메틸레이션'과 같은 발음이 난해할 수 있으니, 시간을 두고 반복하여 연습해야 합니다. 이러한 발음 연습은 영어 발음 교정을 돕고, 영어를 자연스럽게 말하는 데 기여할 것입니다.

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