espial
n. 观察,侦探,间谍活动
1. the act of detecting something; catching sight of something
When the waggon had passed on, Gabriel withdrew from his point of espial.
当马车继续前进的时候, 加布里埃尔也离开了他窥探的地点.
You will have a bit espial to see how the temperature change.
稍加观察就可以看出温度是怎样变化的.