For the past three years, I have served as a monitor to the class that you know well, and which has been praised all over Beijing.

在过去三年，本人一直担任班长。对于我们的班级，您必定知悉，我们的成绩早已为市民所赞赏。

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They used a computerized system to monitor over time the position of starved or well-fed flies as the flies circled around a droplet of apple cider vinegar, which served as a delectable food source.

他们采用一套电脑系统对处在饱足或饥饿状态的果蝇在美味食物资源- - -一滴苹果醋周围的位置随时间的变化进行监测。

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I once served as the monitor of class and enjoy a strong responsibility, so obtained the teachers and students' consistent high praise.

曾担任过班长，在工作期间认真负责，得到了老师和同学的一致好评。

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