1·This treatment helps tone the body, firm up muscles and tighten the skin.
这种治疗可以帮助保持体态，使肌肉变结实、皮肤紧致。
—— 《柯林斯英汉双解大词典》
2·The commission should not take the Microsoft decision as encouragement to jump on every dominant company when competitors complain about it, for firms' grips can loosen as well as tighten.
欧洲委员会不应该把对微软的处理推而广之。 一有竞争者抱怨，就约束占优势地位的公司，这种做法并不合理，因为一些公司的垄断可紧可松。
3·Spending is predicted to fall by as much as 6% this year, as shoppers close purses and tighten belts.
今年，预计消费减少6%，原因是购物的人们都攥紧钱包，扎紧了腰带。
4·I watched him sit on a step to tighten the LACES on his dress shoes.
我看着他坐在石阶上，系紧礼服鞋的鞋带。
5·Thread the wide end through the top of the knot and pull it down to tighten.
让宽端从结里传过来，然后向下拉紧。
1·This mechanical seal is produced by the mating and slight crushing of the threads when a wrench is applied to tighten the fittings.
当用扳手上紧配件时，这种机械密封会在螺纹配合和轻微的变形来生成密封效果。
2·Attach the regulator. Fasten the regulator to the cylinder and tighten the inlet nut securely.
连接调整器。把调整器紧固在钢瓶上，安全地上紧入口螺母。
3·Fasten the regulator to the cylinder and tighten the inlet nut securely.
把调整器紧固在钢瓶上，安全地上紧入口螺母。
4·Make up and tighten the bolts diagonally when the X-tree is installed.
安装采油树是要对角上紧螺栓。
5·Tighten leaf spring press until bushing is extracted from leaf spring.
上紧叶片弹簧加压机直到衬套被拔出叶片弹簧。
1·Tighten or replace components as necessary.
必要时扭紧或更换部件。