"caught by a couple of alert cops" "alert enough to spot the opportunity when it came" "constantly alert and vigilant, like a sentinel on duty"
"insomniac old people" "insomniac nights" "lay sleepless all night" "twenty watchful, weary, tedious nights"
Ever anxious and watchful of her mother.
牛津高阶第八版
美国韦氏词典
Dictionary.com
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维基百科 (自由的百科全书)