keep an eye open for的用法和樣例：
例句
用作動詞 (v.)
- He asked his broker to keep a weather eye open for any significant change in the price of gold as he was considering another purchase.
他請他的經紀人嚴密注視黃金價格的重大變化，因為他正考慮再購進一批。 - Look out for symptoms of depression.
留心看有無抑鬱癥狀。 - She kept an eye on the kids when they were playing in the playground.
孩子們在操場上玩的時候，她仍然留心看著他們。
