watchful相关例句和用法
The entrances are guarded by watchful security staff..入口处由警惕的保安人员把守。
watchful英英释义注意的，警惕的英释adjadjvery careful to notice what is happening, and to make sure that everything is all right
watchful 真题例题真题例句...children who are watchful will be better able to stay away from Unsafe situations。
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