炉火纯青; 时机成熟，濒临危急关头

ph.

1. Affairs came to a head then.
当时事情已到了严重关头。

1. 成熟：come to a full stop 完全停止 | come to a head 成熟 | come to a period 结束

2. 到了紧要关头：come off it 少废话,别瞎扯 | come to a head 到了紧要关头 | come to think of it 想起来了

3. 关键时刻：come through/off with flying colors干得出色,大获成功 | come to a head关键时刻 | come up in the world身价提高

4. 到了紧要关头; (事情)成熟; 达到顶点; 疮疖化脓：come into one's head 想到(某事), 产生(某想法) | come to a head 到了紧要关头; (事情)成熟; 达到顶点; 疮疖化脓 | draw to a head 到了紧要关头; (事情)成熟; 达到顶点; 疮疖化脓