在什么后面Behind what；
behindadv.在(或向)…的后面；在后面较远处；
prep.在(或向)…的后面；在(或向)…的背面
\'There you are,\' said a voice behind me.
“你来啦。”我身后一个声音说道。
He wasn\'t well, so we had to leave him behind.
他身体不适，因此我们只好把他留下。
She started the last lap just behind the leading group.
她开始跑最后一圈时紧跟在领先的一组人后面。
