The drugs tend to cause drowsiness.
這些藥常常使人昏昏欲睡。
The cause of the fire is not yet known.
火災的原因尚不清楚。
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.
失業是貧困的主要原因。
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