1.look up 在字典中查找；向上看。I will look up this word.我將要在字典中查找這個單詞。Look up,there is a plane in the sky.向上看，天上有架飛機。2.look for 、尋找I am looking for my dog.我正在尋找我的狗.3.look over 醫生給病人仔細檢查身體The doctor is looking over Tony.醫生在給托尼檢查身體。4.search for 搜尋，查找I am searchng for some useful information on the Internet.我正在網上查找有用的信息。5.search out 找到
The lawyer searched out the weaknesses in the witness's statement.
律師找出了證人供詞中的漏洞。