Well, for one thing, he's my sister's boyfriend. Ann talks about Jack all the time.
首先,他是我妹妹的男朋友。安整天就是杰克长杰克短的。
A bird may be known by its song.
什么鸟唱什么歌。
In the first place, any scientific study requires that there be no preferential weighting of one or another of the items in the series it selects for its consideration.