例句：
The railway slopes up slightly at this point.
铁路从这里开始有个微微向上的坡度。
Put your hand up if you need more paper.
若有人还要纸，请举手。
Teachers are up against some major problems these days.
老师们最近面临着一些重大问题。
Make sure that sign's the right way up.
一定不要把这招牌挂颠倒了。
Put your hand up if you know the answer.
知道答案就举手。
