吃力不讨好: a thankless task; arduous but fruitless; be a fool for one's pains; do a hard but thankless job; look for a needle in a bundle of hay; work hard but get little result 短语和例子要是你想帮助他这个人, 那将是吃
这事吃力不讨好: the effort though with good intentions does not work well
