figure/work sth out 弄清楚

To understand something or to find the answer to something by thinking about it.

例句：

There will be a full investigation to work out what caused the accident.

将进行全面调查，找出事故原因。

Investigators needed several months to figure out that a fraud had been committed.

调查人员需要几个月的时间来查明是否有欺诈行为。