eye opening的用法和樣例：
例句
- The police were asked to keep an eye open for the little boy who had got lost in the square.
警方奉命密切注意在廣場走失的小男孩子(的方向)。 - Keep a weather eye open for any small faults with your car- if they're not repaired immediately they could cost you a lot of money later.
汽車無論出什麼小毛病，你都要留心——如果不立即修理，說不定哪一天會使你花去許多錢的。
