be on one's last legs; linger on in a steadily worsening condition; 苟延残喘
spread; 蔓延
In case of rain the mass meeting will be postponed till the first fine day. 大会遇雨顺延。
engage a teachers; invite teachers to school; 延师
send for a doctor 延医
Yan Cen 延岑
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)