how far后面加什么词

　　Navigation is good and there's a display to show how far you've drilled down.

　　导航很好，可以显示你正在看哪一级信息。

　　Think of how far we have come in a little time

　　想想我们在短短的时间内取得如此大的进展。

　　It would depend how far down the line the relationship was.

　　这得视这一关系到底发展到了什么程度而定。

　　Parallel lines will never meet no matter how far extended

　　无论延伸多长，平行线永不相交。

　　But it is not clear how far they could help with the work on a power plant.

　　但他们在电厂工程中能给予多少帮助尚不清楚。