쉐도잉 연습: A guide to the energy of the Earth - Joshua M. Sneideman - YouTube로 영어 말하기 배우기

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The End Energy is all around us,
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The End Energy is all around us,
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a physical quantity that follows precise, natural laws.
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Our universe has a finite amount of it.
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It's neither created nor destroyed,
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but can take different forms,
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such as kinetic or potential energy,
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with different properties and formulas to remember.
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For instance, an LED desk lamp's six-watt bulb transfers six joules of light energy per second.
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But let's jump back up into space to look at our planet,
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its systems, and their energy flow.
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Earth's physical systems include the atmosphere, hydrosphere, lithosphere, and biosphere.
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Energy moves in and out of these systems,
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and during any energy transfer between them,
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some is lost to the surroundings,
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as heat, light, sound, vibration, or movement.
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Our planet's energy comes from internal and external sources.
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Geothermal energy from radioactive isotopes and rotational energy from the spinning of the Earth are internal sources of energy,
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while the sun is the major external source,
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driving certain systems like our weather and climate.
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Sunlight warms the surface and atmosphere in varying amounts,
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and this causes convection, producing winds and influencing ocean currents.
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Infrared radiation, radiating out from the warmed surface of the Earth,
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gets trapped by greenhouse gases and further affects the energy flow.
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The sun is also the major source of energy for organisms.
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Plants, algae, and cyanobacteria use sunlight to produce organic matter from carbon dioxide and water,
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powering the biosphere's food chains.
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We release this food energy using chemical reactions, like combustion and respiration.
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At each level in a food chain,
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some energy is stored in newly made chemical structures,
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but most is lost to the surroundings as heat,
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like your body heat, released by your digestion of food.
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Now, as plants are eaten by primary consumers,
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only about 10% of their total energy is passed on to the next level.
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Since energy can only flow in one direction in a food chain,
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from producers on to consumers and decomposers,
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an organism that eats lower on the food chain is more efficient than one higher up.
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So eating producers is the most efficient level at which an animal can get its energy.
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But without continual input of energy to those producers,
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mostly from sunlight, life on Earth as we know it would cease to exist.
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We humans, of course, spend our energy doing a lot of things There's a lot of things besides eating.
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We travel, we build, we power all sorts of technology.
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To do all this, we use sources like fossil fuels,
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coal, oil, and natural gas,
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which contain energy that plants captured from sunlight long ago and stored in the form of carbon.
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When we burn fossil fuels in power plants,
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we release this stored energy to generate electricity.
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To generate electricity, heat from burning fossil fuels is used to power turbines that rotate magnets,
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which in turn create magnetic field changes relative to a coil of wire,
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causing electrons to be induced to flow in the wire.
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Modern civilization depends on our ability to keep powering that flow of electrons.
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Fortunately, we aren't limited to burning non-renewable fossil fuels to generate electricity.
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Electrons can also be induced to flow by direct interaction with light particles,
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which is how a solar cell operates.
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Other renewable energy sources, such as wind,
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water, geothermal, and biofuels, can also be used to generate electricity.
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Global demand for energy is increasing,
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but the planet has limited energy resources to access through a complex energy infrastructure.
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As populations rise alongside rates of industrialization and development,
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our energy decisions grow more and more important.
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Access to energy impacts health,
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education, political power, and socioeconomic status.
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If we improve our energy efficiency,
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we can use our natural resources more responsibly and improve quality of life for everyone.

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이번 영상에서는 지구의 에너지 흐름과 그 작용에 대해 배웁니다. 웅장한 우주에서부터 지구의 다양한 시스템—천기, 수권, 암석권, 생물권—까지 에너지는 어떻게 이동하는지를 탐구할 것입니다. 또한, 여러 에너지 형태와 그로 인해 발생하는 생태계 내의 에너지 전환 과정, 그리고 인간이 에너지를 어떻게 활용하는지를 이해하게 됩니다.

주요 어휘 및 구문

  • 에너지 (Energy)
  • 태양 (Sun)
  • 생물권 (Biosphere)
  • 화석 연료 (Fossil fuels)
  • 열 (Heat)
  • 생명체 (Organisms)
  • 광합성 (Photosynthesis)
  • 전기 (Electricity)

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이 영상을 통해 영어 쉐도잉을 연습할 때는, 원어민의 발음과 리듬을 따라하는 것이 중요합니다. 영상의 속도는 비교적 적당하므로, 따라 읽기를 하며 자연스럽게 음성을 생생하게 모방해보세요. 특히 강조되는 부분에서는 목소리의 높낮이와 억양을 신경 써서 듣고 발음해보는 것이 효과적입니다. 영어 회화 연습의 일환으로 이 영상을 반복적으로 시청하며, shadow speaks 기술을 활용하세요. 말을 하면서 발음의 미세 조정을 연습하고, 궁극적으로는 자연스러운 대화가 가능하도록 하세요. 계속해서 연습하면, 여러분의 영어 실력도 향상될 것입니다.

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