cannot help but、however辨析

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(1)cannot help but
(2)however

在英语中有些情况下都包含或表示“无奈”的意思。以下是部分词语的详细解释和区别:

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howeverhow.ev.er[haJ`ZvL; hauˋєvə]副词（无比较级、最高级）1 [引导让步的副词子句] 无论如何… （no matter how）H~ long a vacation is, I always feel I want a few days more.无论假期有多长,我总觉得想再多几天休息休息H~ tired you may be, you mus ...