cannot 和 can not

否定性动词cannot也可以被写为can not,但前者一般更适当。Can not 形式特别着重表达的是这个动词的否定性,因此仅在想要表达这种强烈意思的时候用can not才适当。而这一般有两种情况,一是来表达特别重要的主张,一是当not表达的否定意义与读者的期望相反时。通常如果不是此类情况,则应该用cannot。

以下我们举出两个例子来说明恰当使用can not的典型情况。

  1. Francis et al. claimed that these tubules dilate sufficiently that they can allow a flow rate of 3 cm3/s, but our experiments clearly demonstrate that they can not. In fact, we have found that even under extreme conditions, the maximum flow rate is less than 1 cm3/s.
  2. The main finding of this study is that for a > ac,  when computing the velocity, we can not ignore the nonlinear coupling of modes.

发表评论

Your email address will not be published.

X

已达到阅读文章上限。免费订阅,获取更多

已达到阅读文章上限。免费订阅,获取更多
关于科研写作和学术出版的文章与学术资源,包括:

  • 820 +文章
  • 15+ 免费在线讲座
  • 10+ 专家播客
  • 10+ 电子书
  • 10+ 检查清单
  • 50+ 信息图