个人觉得这不是完整的一句话,前面应该还有半句条件句.
所以这样的句子是有固定的表达方法的,是一个倒装句.
“Only by ...,can we accomplish this task eventually."
比如：“只有我们努力工作,我们才能完成这项任务.”
“Only by working hard,can we accomplish this task eventually."
【公益慈善翻译团】真诚为你解答!