You cannot quit smoking too soon.

你愈早戒烟愈好。

youdao

Countries cannot quit the euro without extreme economic pain, but nor is it easy to fix.

除非是遭受了极其严重的经济创伤，不然欧元区成员国不能退出欧元区。 而且如果真遭受了极其严重的经济创伤，脱离欧元区独自修补也不容易。

youdao

They must have their job to live but they cannot quit studying because education is the only way to rise.

她们要工作求生存，可也无法终止学习，因为教育是改良生活的唯一出路。

youdao

If they cannot, they should quit.

FORBES: Japan's Samurai CEOs (1) Panasonic's Tsuga Kazuhiro

Mr Trimble pledged to his party last year that he would quit if the IRA had not started decommissioning its arsenal by the end of January, saying that there cannot be an "armed peace".

BBC: Loyalist warning over arms crisis