carefully observant or attentive; on the lookout for possible danger;
"a policy of open-eyed awareness" "the vigilant eye of the town watch" "there was a watchful dignity in the room" "a watchful parent with a toddler in tow"
例句
用作形容词(adj.)
Their wedding was an open secret.他们的婚礼是公开的秘密。
All of his dealings are in the open.他的一切交易往来都是公开的。
She is a very friendly,open person.她是一位很友好很坦率的人。
I am sure you will give me a plain and open answer.我相信你一定会给我一个简单，坦率的答复。
