yí
yī
dàn
dàn
1
in case (sth happens)
2
if
3
once (sth happens, then...)
4
when
5
in a short time
6
in one day
现在我年纪大了,一旦受伤了,就要很长时间才能康复。
I'm old now, if I am injured it will take a long time to recover.
一旦错过了这次的比赛,就要等五年后才能再看了。
If you miss this game, you will have to wait five years before you can see it again.
一旦喜欢上一个人,就会不顾一切地去爱他。
When she loves someone, she will love him no matter the cost.
一旦你决定了,就要全力以赴。
Once you make a decision, you should give it your all.
一旦发生紧急情况,立刻报警。
In case of an emergency, call the police immediately.
一旦错过了这个机会,就可能后悔一辈子。
Once you miss this opportunity, you may regret it for the rest of your life.
一旦开始了这项任务,就要坚持到底。
Once you start this task, you must see it through to the end.
一旦确定了计划,就要按时执行。
Once the plan is confirmed, execute it on schedule.
一旦遇到问题,我们应该积极解决。
Once we encounter a problem, we should actively solve it.
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