Paradoxically, it is just this difficulty that makes them such effective study tools, research suggests.
矛盾的是，研究者认为正是考试的难度让其成为如此有效的学习工具。
A few years ago, many (if not most) shops did not have access to bug tracking systems, version control, and other such tools; it was just the developers and their IDE of choice.
几年之前，很多(如果不是大部分)团队都没有使用bug跟踪系统，版本控制，和其他类似工具；只有开发人员和他们选择的IDE。
You should firstly not worry about English, it is just one of the most useful tools in our life, such as PC, digital camera and so on.
您应该首先不用担心英语，它只是最有用的工具之一，在我们的生活，如电脑，数码相机等。
You should firstly not worry about English, it is just one of the most useful tools in our life, such as PC, digital camera and so on.
您应该首先不用担心英语，它只是最有用的工具之一，在我们的生活，如电脑，数码相机等。
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