注意到某人正在做某事 notice sb. doing sth ; Note someone is doing something
注意到某人在做某事 observe sb. doing sth
经过数百个小时的观察，他们感到沮丧。有一天，他们注意到一个女人拿着纸巾在做一件人们一直在做的事情：把东西擦干净，然后扔掉纸。
Frustrated after hundreds of hours of observation, they one day noticed a woman do with a paper towel what people do all the time: wipe something up and throw it away.
1856年，18岁的理科生威廉·珀金在做实验时注意到一些奇怪的事情。
In 1856, William Perkin, an 18-year-old science student, noticed something strange while doing an experiment.
最奇怪的是，他完全没有注意到自己在做什么。
Weirdest of all, he didn't even notice he was doing it until the nurse asked him what he was drawing.
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