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重点讲解：
1.recall召回；
The company said it was recalling one of its drugs and had stopped selling two others.
该公司说它正在召回它的一种药品，而且已经停售了另外两种药品。
2.pretensioner预紧器；
In this paper, first, a new type of vehicle safety belt is developed based on a new clutch proposed as the key part of pretensioner of safety belt.
提出了一种作为安全带预紧器核心部件的新型离合机构，应用该机构开发了一套新型预紧式汽车安全带，介绍了它的结构组成、工作原理和性能。
提出了一种作为安全带预紧器核心部件的新型离合机构，应用该机构开发了一套新型预紧式汽车安全带，介绍了它的结构组成、工作原理和性能。
