observing

/əbˈzɜːvɪŋ/ 26高考四级六级考研雅思托福
If you observe a person or thing, you watch them carefully, especially in order to learn something about them. 观察

verb [vt. 及物动词]注意到,观察到;注视,监视;(在科学研究中)观测,发现(observe 的现在分词)

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: