the act of watching sb/sth carefully for a period of time, especially to learn sth 观察；观测；监视
Most information was collected by direct observation of the animals’ behaviour.
大部分信息都是通过直接观察动物的行为收集到的。
results based on scientific observations
根据科学观测得来的结果
We managed to escape observation (= we were not seen).
我们设法避开了人们的注意。
The suspect is being kept under observation (= watched closely by the police).
嫌疑人正受到监视。
She has outstanding powers of observation (= the ability to notice things around her).
她有超人的观察力。
an observation post/tower (= a place from where sb, especially an enemy, can be watched)
瞭望哨；瞭望塔