TSUMUGU · TOCFL C1 (est.) · 詞
先後
ㄒㄧㄢ ㄏㄡˋ · xiānhòu
noun — order, sequence (which comes first, which after); adv — one after another, successively
關 · Related
次序cìxùorder, sequence — the plainer synonym前qiánhòubefore-and-after — the parallel pair