The dry spell sank the river.

干旱的天气使河水下降。

The dry spell is over.

旱象已经解除。

The dry spell blighted the crops.

干旱期使农作物枯萎了。

A dry spell threatened the crops last year.

去年一段旱期威胁着庄稼。

A dry spell threatened the crops last year.

去年庄稼受到严重干旱的威胁。