look through 仔细检查〔审查〕(某物)look over仔细检查〔审视〕(某人或某物)look over可审视人，检查人。而look through不行
同样为检查，look through 比look over更为彻底，如同think over和think through
如果要说区别的话，我个人觉得应该从介词入手。through有“穿过”的意思over则是只是“停留在表面”
