observing

If you observe a person or thing, you watch them carefully, especially in order to learn something about them. ^观察

Olson also studies and observes the behaviour of babies.
奥尔森还研究并观察婴儿的行为。

单词造句:

复合词observingly/əbˈzɜːvɪŋli/adv.注意地

原型observe/əbˈzɜːv/vt. 注意到；观察；遵守；说；评论