知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区. ☒ the authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. 在stata中遇到file could not be opened的错误提示,通常有以下几个原因:
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为什么 could 比 can 更委婉？ 一般国内的人只会说 could 比 can 更委婉，顶多再多说一句：could 是 can 的过去式，所以更委婉。 打算回答本问题的各位朋友，如果只能给… 显示全部 关注者 8
The experts considered the likelihood that risks could become serious problems in the future.they.
Could not convert string to float 使用float ()函数来转换字符串为浮点数是，python抛出valueerror，并提示，could not convert string to float，意思是无法将参数指定的字符串转换为浮点.
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