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be of no avail; be of no help❍ 要是我早知道我的劝告～. 那我就不会来了。If Ihad known that my advice would be of no help,I would not have come here.
of no avail; of no help;to no useful purpose
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。