跟读练习: SDLC Vs STLC: Software Development Life Cycle and Software Testing Life Cycle - 通过视频学习英语口语
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Suppose you are assigned a task to develop a custom software for a client.
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Each block below represents a step required to develop the software.
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Irrespective of your technical background, try and make an educated guess about the sequence of steps you will follow to achieve the task.
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The correct sequence would be gather as much information as possible about the details
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and specifications of the desired software from the client.
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This is nothing but the requirements gathering stage.
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Plan the programming language like Java, PHP, .NET, and database like Oracle,
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MySQL, etc. which will best suit the project.
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Also determine high level functions in architecture.
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This is the design stage.
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Actually code the software.
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This is the build stage.
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Next you test the software to verify that it is built as per the specifications given by the client.
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This is the test stage.
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Once your software product is ready, you may do some code changes to accommodate enhancements requested by the client.
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This would be the maintenance stage.
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All these levels constitute the waterfall method of a software development lifecycle.
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As you may observe, testing in the model starts only after implementation is done.
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But if you are working on a large project where the systems are complex, it's easy to miss key details in the requirements phase itself.
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In such cases, an entirely wrong product will be delivered to the client.
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You will have to start afresh with the project.
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Or if you manage to note the requirements correctly but make serious mistakes in design and architecture of your software,
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you will have to redesign the entire software to correct the error.
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Assessments of thousands of projects have shown that defects introduced during requirements
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and design make up close to half of the total number of defects.
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Also, the costs of fixing a defect increases across the development lifecycle.
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The earlier in the lifecycle a defect is detected, the cheaper it is to fix.
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As they say, a stitch in time saves 9.
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To address this concern, the V model of testing was developed.
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For every phase in the development lifecycle, there is a corresponding testing phase.
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The left side of the model is the software development lifecycle, SDLC.
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The right side of the model is the software test lifecycle, STLC.
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The entire figure looks like a V, hence the name V-Model.
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In this figure, you'll find a few stages different from the waterfall method.
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These differences, along with the details of each testing phase, will be discussed in a later tutorial.
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Apart from the V model, there are iterative development models, where development is carried out in phases, with each phase adding a functionality to the software.
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Each phase comprises of its own independent set of development and testing activities.
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Good examples of development life cycles following the iterative method are Rapid Application Development, and Agile Development.
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Before we close this tutorial, here are a few pointers.
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You must note that there are numerous development lifecycle models.
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The development model selected for a project depends on the aims and goals of that project.
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Testing is not a standalone activity, and it has to adapt with the development model chosen for the project.
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In any model, testing should be performed at all levels, right from requirements gathering all the way up to maintenance.
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本视频的口语练习目标
通过观看这段关于软件生命周期的视频，你能锻炼英语影子跟读的流畅度，尤其是在处理专业术语较多的长段落时，提升边听边说的同步性。这对雅思口语练习中需要清晰表达复杂概念的场景很有帮助，能让你在描述流程、解释逻辑时更有条理。
实用短语库
- "irrespective of your technical background"（无论你的技术背景如何）
- "make an educated guess"（做出有根据的猜测）
- "accommodate enhancements"（适应改进需求）
- "a stitch in time saves nine"（及时一针省九针，即防微杜渐）
- "standalone activity"（独立活动）
这些短语不仅能用于技术话题，在日常交流或雅思口语练习中也能增色，比如用"make an educated guess"描述对未知事物的推测。
攻克口语弱点
视频中长句较多，如"Assessments of thousands of projects have shown that defects introduced during requirements and design make up close to half of the total number of defects"，其节奏和重音分布是练习重点。通过英语影子跟读，你能学会如何自然断句，避免因句子过长而卡壳。此外，"hence the name"等连接词的弱读的处理也很关键，这能让你的口语更接近母语者水平。
作为一个不错的shadowing site，看YouTube学英语是个好方法。你可以反复播放视频，模仿 narrator 的语气和语速，这比单纯背单词更能提升口语流畅度。坚持用这种方式进行英语口语练习，你会发现自己在处理复杂句式时越来越得心应手。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。