1. 留神的：open-ended 末端开口的 | open-eyed 留神的 | open-faced 露面的
2. 留神的/惊讶的：open-ended /末端开口的/自由回答的/ | open-eyed /留神的/惊讶的/ | open-faced /露面的/坦率的/
adj
1. carefully observant or attentive
on the lookout for possible danger
e.g. 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
Synonym: argus-eyed vigilant wakeful