alert, cautious, considerate
这一组形容词都表示小心的，谨慎的。alert a.警惕的，留神的。
The hostess remained standing, alert to every guests drinking need.女主人一直站在旁边时刻准备给大家斟酒。
cautious a.细心的，谨慎的。
He has a cautious attitude about spending money.在花钱的问题上他态度谨慎。
considerate a.关心他人的，体贴的。
He is always considerate of others; he is kind and sympathetic.他总是很体谅他人，并且慈祥而富有同情心。
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