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stress是可数名词还是不可数名词?

题目详情
stress是可数名词还是不可数名词?
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答案和解析
许多人习惯上喜欢把介词加到及物动词后面,然后才带出宾语.最常见的是"emphasize/stress on/upon"和"discuss about",如:
⑧ Singaporeans seem to have emphasized on material gains.
⑨ In our education system,we stress upon examination results.
⑩ World leaders spent a lot of time discussing about worsening economic problems.
显然的,这三句里的介词"on/upon"和"about"是多余的,不必要的.