相关单词近義詞 gratis 免費的, free 自由的, gratuitous 無緣無故的, complimentary 問候的臨近詞Coston, cost, cost of sampling, Costica Dafinoiu, cost-increment, cost rnanagement, cost terminology, cost and expense, cost development, Cost in Hospital, cost of building, cost transaction 返回 costless