look up 和look for 的区别：含义不同、用法不同、强调重点不同。look up中文翻译为“查阅”、“探望”，侧重于指在词典等资料里查阅；look for中文翻译为“寻找”、“渴望”、“盼望”，强调寻找的动作和过程。
一、look up的含义及用法
look up作为动词，意为查阅;查找;探望;看望。
例句：I looked your address up in the personnel file...
我在人事档案里找到了你的地址。
I'll try to look him up, ask him a few questions...
我会设法登门拜访，问他几个问题。
She just grunted, not deigning to look up from the page.
她只咕哝了一声，继续看书，不屑抬起头来看一眼。
He turned his face to look up at the sky in a carefree manner.
他仰首望着天，做出一副满不在乎的神气。
Don't look up every unknown word in your dictionary.
不要在字典里查每一个不认识的单词。
Don't just move up and down. Don't just look up
不要只上下移动不要只往上看
I couldn't look up. My eyes were getting wet.
我眼泪盈眶，抬不起头来。
she didn't look up from his eyes, a head lower than hers.
她的眼睛简直没法从他的目光里移开，他比她低了一个头。
二、look for的含义及用法
look for作为动词，意为寻找;探索;渴望;盼望。
例句：Which features do you look for when choosing a car?
你挑选轿车时要着重哪些特点？
We all need to look for ways to reduce our carbon footprint.
我们都需要寻求降低碳排放量的方法。
They look for foods that are low in calories.
他们要找低卡路里的食物。
Look for hotels in the French Quarter.
在法国人居住区寻找旅馆。
He thumbed through the directory to look for her number.
他翻阅电话号码簿找寻她的号码。
A second experiment was designed to look for signs of catabolism.
第二个设计的实验是企图寻找分解代谢的迹象。
Look for time when you complete a unit of study.
当你完成一个单元的学习时，找时间复习。
