ascertain是什么意思

vt.确定,探知

1. We need to ascertain the cause of the problem before we can come up with a solution.
在找到问题的原因之前，我们需要确定一下。
2. The detective worked tirelessly to ascertain the identity of the killer.
这名侦探不辞辛劳地查明了凶手的身份。

确定；查明；弄清