det.他们的;她们的;它们的;(在提及性别不详的人时,用以代替his或her);
例句:
Horses were poking their heads over their stall doors.
马儿们从马厩门上探出头来。
They went over to Christianity.
他们献身于基督教.
Janis and Kurt have announced their engagement...
贾尼斯和库尔特已宣布订婚。