[shí jī]
opportunity; an opportune moment
choice of the right moment
时机的选择
when the opportunity arises; at the opportune moment
时机一到
miss the opportunity
错过时机
wait for an opportunity; bide one's time
等待时机
lose no time in doing sth.
不失时机地做某事
a well-timed action
时机恰当的行动
The opportunity has not yet arrived.
时机尚未成熟。