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gratuitouslyadv.

græ'tju:itəsli
中文adv. 无偿地;不必要地;无缘无故地;平白地
词根词源
gratuitously (adv.)1690s, "without cause or reason," from gratuitous + -ly (2). From 1716 as "without cost to the recipient."
关键词
gratuitously