He could not prevail with her, however hard he tried.
无论他如何努力都无法说服她。
youdao
我们都已尽了最大的力量。不过我们还是输了。
However hard he tried, he couldn't remember the text.
不论他多么努力，他也不能熟记课文。
And a nickname - Clutch - that he couldn't shift, however hard he tried.
BBC: Norfolk - Prose: Coming Home
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