When lost pets are brought to animal shelters, people there use a special tool to look for the microchip and read the ID number on it, then they'll call the microchip company to match the number to the information of the pet's owner.

当走失的宠物被带到动物收容所时，那里的人们会使用一种特殊的工具来寻找微芯片，并读取它上的身份证号，然后他们会打电话给微芯片公司，以匹配号码与宠物的主人的信息。

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When you have the brush tool selected, pressing the number keys will adjust the brush opacity.

当你已经选择了画笔工具，按下数字键可以调整画笔的不透明度。

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That is an astonishing number for a communications tool that is only about 25 years old.

对于一个只有25年之久的通信工具来说，这是个惊人的数字。

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Well a number of you have spent this past week playing with this particular tool which is a project the course has been working on for some time in an effort to make it easier and more social to actually shop for courses.

在过去的一周里,已经有一部分人开始使用这种特殊的工具了,这门课程一直在致力于这一工具的开发,目的是为了让课程变的更简单,选课更人性化。

哈佛公开课 - 计算机科学课程节选

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