hardness

n. 坚硬,困难,严厉,勇气

hard-line, hard-liner, hard-nosed, hard-pressed, hard-top, hard-wearing, hard-working, hardback, hardbitten, hardboard, harden, hardened, hardheaded, hardiness, hardly, hardly any, hardly ever, hardly...before/when, hardly...when, hardly...when..., hardship, hardware, hardwood, hardworking, hardy, hardy annual, hare, hare-brained, harebell, harebrained, harelip, harem, haricot, hark, harlequin, harlequinade, harlot, harm, harmful, harmfully,