&&地球上70%是水30%是陆地&&用英语怎么说
问题描述：
&&地球上70%是水30%是陆地&&用英语怎么说
到底用by还是with
答
70 percent of the earth's surface is covered by water and the other 30 percent by land.
by,with都是对的,被动式加by肯定是没错,cover+with也是搭配,所以两个都可以的