1）look over 指檢查時：If you look something over, you examine it in order to get an idea of what it is like. 檢查 【即你仔細檢查的目的是想知道這個東西是怎么樣的】

如：They presented their draft to the president, who looked it over, nodded and signed it.

2）check over 主要是看一下check的意思

If you check something such as a piece of information or a document, you make sure that it is correct or satisfactory. 檢查; 核實 【如果，你檢查信息或文件的話，是為了確定是否準確】

他總是先將手稿仔細檢查一遍再交給打字員?！緳z查看是否準確哦】

3）examine If you examine something, you look at it carefully. 仔細檢查 【沒有說檢查的目的，即目的性不是很明確哦】

如： He examined her passport and stamped it.