时时机。时机错过就不会再来了。指行事不要放过时机。
《国语·越语下》得时无怠，时不再来，天予不取，反为之灾。”
事机一失，～，惟望宸断。★清·陈忱《水浒后传》第七回
Learn the next connected idiom: 时不再来 (shí bù zài lái) → 来之不易 (lái zhī bù yì)
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