No matter how much he efforted, and always failed again and again希望可以帮助你，满意的话，希望采纳，谢谢！
However hard he tried, he always fail
为您解答always fail
hard-working as he is ,however,it always seems to be failed.
He and his friends went to war with callaghan many times, but always failed。
无论他怎么努力,似乎总是失败 用however翻译 英语的正确表达法就是:No matter however hard he tried, it seemed that he just failed time after time.无论他怎么努力，似乎总是一次又 一次地失败了。 很希望我的回答会对你有帮助。如有不明白，可以再追问，若满意请采纳，谢谢你，并祝你进步!
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冰枫星雨
