...careful observation of the movement of the planets. [+ of]

对行星运动的仔细观测

In hospital she'll be under observation all the time.

医院会对她24小时密切观察。

This book contains observations about the causes of addictions. [+ about]

该书包括有关成瘾原因的观察发现。

'You're an obstinate man,' she said. 'Is that a criticism,' I said, 'or just an observation?'.

“你是个很执拗的人，”她说道。“你这是批评呢，”我说，“还是只是发表评论而已？”

She has good powers of observation.

她的观察力很敏锐。