hard core

(a) rubble, broken bricks, etc (used for foundations, roadmaking, etc) （用作地基、 路基等的）碎石、 碎砖等. (b) central, basic or most enduring part (of a group, etc) （某一组织等的）中坚力量, 基干部分, 最坚定的一部分人: the hard core of the opposition 在反对党内的中坚分子.

happen on, happen to, happening, happily, happiness, happy, happy-go-lucky, hara-kiri, harangue, harass, harassment, harbinger, harbor, harbour, harbour (US harbor), harbour-master, harbourage (US harborage), hard, hard cash, hard copy, hard court, hard cover, hard currency, hard disk, hard drug, hard labour, hard of hearing, hard porn, hard sauce, hard shoulder, hard water, hard-and-fast, hard-bitten, hard-boiled, hard-headed, hard-hearted, hard-hitting, hard-line, hard-liner, hard-nosed,