例句：

　　How fast would the disease develop?

　　這種疾病發(fā)展有多快？

　　We need to develop local industries.

　　我們需要發(fā)展地方工業(yè)。

　　These clashes could develop into open warfare.

　　這些沖突可能會發(fā)展成公開的戰(zhàn)爭。