通过其中一个开口放置关节镜，这是一个观察设备，允许外科医生看到膝关节内部。

An arthroscope is placed through one of the openings. This is a viewing device that allows the surgeon to see inside your knee.

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这是一个很简单的问题，通过观察重量是多少以及它下降了多远，来确定桨轮做了多少功。

It's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddlewheel.

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尽管这是一个有趣的证据，但是还没有人观察到金星的火山喷发，所以我们不能肯定。

Although this is intriguing evidence, no one's actually observed a Venus volcano erupting yet, so we can't be positive.

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And then, there is Bohr's wife who is the observer.

这是波尔的妻子，她是一个观察家。

麻省理工公开课 - 固态化学导论课程节选

This inner cell mass develops into the embryo, which this here shown at a later stage is beginning to be clear that it's becoming an organism that looks like us.

内细胞群发育成为胎儿,这张图这是一个相对晚期的阶段,能越来越清晰地观察到,这团东西开始有个人形了

耶鲁公开课 - 生物医学工程探索课程节选