“a shot in the dark”别理解成“暗中射击”，真实含义是瞎猜；盲干。

【例句】
We had nothing to go by. It was a shot in the dark, but it turned out right.
我们是没有根据的，只不过瞎猜，可是结果却猜对了。

The figure he came up with was really just a shot in the dark.
他想出的数字仅仅是无根据的瞎猜。