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1、hard 英[hɑːd]美[hɑːrd]adj.坚固的; 坚硬的; 结实的; 难做的; 难懂的; 难以回答的; 困苦的; 艰苦的; 艰难的;adv.努力地; 费力地; 艰难地; 猛力地; 猛烈地; 彻底认真地。
2、[例句]As our typewriters are made of light and hard alloy they are both portable and endurable.因为我们的打字机是由轻而坚固的合成制成，所以轻便携带又很耐用。