名詞 espial:

1. the act of detecting something; catching sight of something
   同義詞：detection, catching, spying, spotting

es.pi.al

n.（名詞）
The act of watching or observing; observation.
窺探，偵察：觀看或觀察的動(dòng)作；觀察
A taking notice of something; a discovery.
覺(jué)察：注意到某事；發(fā)現(xiàn)
The fact of being seen or noticed.
被看見(jiàn)或被注意

來(lái)源：
Middle English espiaille
中古英語(yǔ) espiaille
from Old French
源自 古法語(yǔ)
from espier [to watch] * see espy
源自 espier [觀察] *參見(jiàn) espy