He unlocked the door of apartment two and disappeared inside after a backward glance at Larry.
他打开2号公寓的门锁,向后瞥了拉里一眼之后走进去就不见了。
If you move or look backward, you move or look in the direction that your back is facing.
向后
She was walking backward on the walkway.
她正在人行道上向后走。