先……后……:(单/动、单/名、近义):表示事物或动作的先后顺序。
E.g. xiān kǔ hòu tián 先苦后甜 no sweet without sweat
xiān lái hòu dào 先来后到 in order of arrival; First come, first served.
xiān rén hòu jǐ 先人后己 put the interest of others above one's own;