This led people to go back and look at the places that were manufacturing the vaccine to make sure that they were all producing vaccine of the proper quality.

这现象让人们回溯并且审视,制作疫苗的地方,以确认他们生产的疫苗,质量都合格

耶鲁公开课 - 生物医学工程探索课程节选

Some people believe that spending money on an advertisement is more important than making a quality product.

有的人相信多花钱做广告比生产质量好的产品更重要。

广告和价格的关系 - SpeakingMax英语口语达人