☒ 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. 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 检查文件路径和名称 确保 boxfile 文件的路径和名称是正确的。 有时候，路.
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The experts considered the likelihood that risks could become serious problems in the future.they.
在stata中遇到file could not be opened的错误提示,通常有以下几个原因:
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.
