HB [英] [eɪtʃ bi:] [美] [etʃ bi] [简] 硬黑;“Hard Black”的缩写 词频排名 29110/55435 学习人数 27240 难度等级 1/10 认知比例 83.79% 例句 HB is short for Hard Black. HB是硬黑的缩写。 The pencil has a HB refill. 这铅笔有硬黑笔芯。 The cookies were HB rocks. 曲奇饼已经变成坚硬的黑块儿。 助记 联想 HB---黑笔!-----黑色的硬铅笔!