They got off scot-free because of lack of evidence.

由于证据不足，他们得以逍遥法外。

The charges were dropped for lack of evidence.

由于缺少证据，起诉被撤销了。

Why is there such a lack of evidence?

为什么会缺乏明确的证据？

He was soon set free for lack of evidence.

因为缺乏证据，他很快被释放了。

The case was dropped for lack of evidence .

这个案子因缺乏证据而被驳回。