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adj.吃力不讨好的；徒劳无功的；不表示感谢的；不受人注意的 英英释义： thanklessadj.not feeling or showing gratitude"How sharper than a serpent's tooth it is / To have a thankless child!"同义词：ungratefulunthankfulnot likely to be rewarded"grading papers is a thankless task"同义词：unappreciated
