“主因”造句

主因未详.
The details of the principal cause are not known.

我开始感到很忧郁, 因为我明知道我是她的受难的主因.
I began to be very pensive , knowing that I was really the instrument of her disaster.

买主因无报盘而苦恼.
Buyers are worried at the lack of offer.

• #主因