一、 refer...to...的用法
1.表示“把……提交给……”或“把……委托给……”之意.例如：
Tom is going to refer the matter to the meeting.汤姆打算把这件事提交到会议上去处理.
I don't want to refer this patient to an irresponsible doctor.我不想把这个病人交给一个不负责的医生.
2.表示“使……向……请教”或“使……求助于……”之意.例如：
I referred her to Tom for further information.我让她到汤姆那儿去询问详情.
The teacher referred me to Chapter III.老师叫我去查第三章.
3.表示“把……归功于……”之意.例如：
He referred his success to the good education he had had.他把他的成功归功于他所受的良好教育.
4.表示“认为……起源于……”之意.例如：
The invention of the papermaking is referred to China.造纸术起源于中国.
二、 refer to 的用法
1.表示“查阅”或“参考”之意.例如：
If you want to know his telephone number,you may refer to the telephone directory.如果你想知道他的电话号码,你可以查电话簿.
2.表示“谈到”或“提到”之意.例如：
Please don't refer to his past again.请别再提他的往事了.
The old soldier referred to his experiences during the Long March.老战士谈到了长征时的一些经历.
3.表示“适用于”或“涉及到”之意.例如：
These books refer to Asian problems.这些书涉及到亚洲问题.
These regulations refer only to children.这些规矩只适用于儿童.
三、 refer to...as...的用法.此短语意为“把……称作……”.例如：
He is referred to as a living Lei Feng.他被称作是一个活雷锋.

look up是个常用词组，“（在词典、参考书中）查阅”的意思,
例如：It is unnecessary to look up every word you don’t know in the dictionary while your are reading.（阅读时,碰到生词,不必都要在词典中查阅.）
其他意思：“抬头看”、“改善”等.
I looked up and saw him.
我抬起来看见了他.
The national economy is beginning to look up.
国民经济正在开始好转.
The worst is over now, and things are beginning to look up.
最坏的景况已经过去,现在情况正在改善.
If trade looks up we may be able to have the shop painted next year.
假如生意景况有所改善的话,明年我们就能够将店铺重新漆一次了