relatives of an emperor; 皇亲国戚
wife's or mother's relatives 外戚
sad; grief; deep sorrow; 哀戚
share joys and sorrows; share weal and woe 休戚相关
Qi Jiguang 戚继光
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)