The car malfunctions whenever it rains heavily.

每当下大雨时，这辆车就会故障。

Every time it rains heavily, the water level will go up.

每次下大雨，水位都会涨水。

It rains heavily in summer in Wuhan.

武汉夏季下大雨。

It rains heavily in wuhan in summer.

武汉夏季下大雨。

Sometimes it rains heavily.Sometimes there are typhoons.

有时下大雨。有时有台风。

Sometimes it rains heavily. Sometimes there are typhoons.

有时下大雨。有时有台风。

The plane will take off as usual unless it rains heavily tomorrow.

除非明天下大雨，否则飞机会正常起飞。

When it rains heavily, water can rush down the sides of mountains.

如果雨下得很大, 雨水就能顺着山涌下来.