1·His efforts to tighten up quality control led to a commercial coup.
他努力加强质量把关，赢得了巨大的商业成功。
2·Republicans want to tighten up the testing part, but not to spend much more money.
共和党人想加强这种测试，但是却不想在这个上面画更多的钱。
3·Objective: to tighten up the hygienic management of food service personnel, and to watch the groups serotypes in area, for prevention food poisoning caused by salmonella from coming on.
目的：为了加强饮食食品从业人员的卫生管理，了解本辖区沙门氏菌菌型变迁的情况，防止因沙门氏菌引起的食物中毒的发生。
4·We need to tighten up security at the prison.
我们必须加强监狱的安全性。
5·That's what I was trying to tighten up now, in this last week, when I was practicing extremely hard.
我失去了发球和正拍，那是我现在尝试要加强的，在过去一周，我极度努力的训练，希望这周可以展现一些。