leap in the dark

1. 冒险的行动

Their move to Latin America was a leap in the dark.

他们迁居拉丁美洲是件冒险的事。

by leaps and bounds

1. 非常迅速地

The production is increasing by leaps and bounds.

生产正在极其迅速地增长。

leap at

1. 向……扑去

The dog leaped at him.

狗向他扑去。