理基础自主初探,提素能语篇突破,巧突破核心句型,学业分层测评,精剖析重点词汇,was lucky enough to,as strong a pull as,twice as far as,now that,off,way,in,up,on,down,into,as strong a pull as,as many mistakes as,twice as far as,as large as,larger than,the size of,now that,Since,for,在启程之前，李彦平向我解释说，在我们的航行中会有三次,引力的变化，而第一次将会是最强的。,学业分层测评点击图标进入,
