cause的例句

The drugs tend to cause drowsiness.

这些药常常使人昏昏欲睡。

The cause of the fire is not yet known.

火灾的原因尚不清楚。

The immediate cause of death is unknown.

造成死亡的直接原因不明。

Unemployment is a major cause of poverty.

失业是贫困的主要原因。