帮忙看看下面的英语句子
问题描述:
帮忙看看下面的英语句子
The moon is our nearest neighbour in space,and like ourselves it is kept tied to the earth by the earth's gravitational pull.
请问kept tied to the earth
答
The moon is our nearest neighbour in space,and like ourselves it is kept tied to the earth by the earth's gravitational pull.
月亮太空中离我们最近的邻居,它也像我们一样,紧紧地被地球引力.
kept tied to the earth
紧紧地被地球引力tied 是什么意思?紧紧地