Noun:

1. a loud steady beat

Backas巴卡斯backn.后面；背脊；靠背；后背；后卫vt.支持；后退adv.向后地adj.向后的；后面的；偏远的；过时的；积欠的back-burn逆风用火backblowingn.反吹back-lash[机] 齿隙back charge[经] 决算后各种费用back impact回爆backing bar衬垫板条backwashing回洗,反萃取,反流,倒流,反溅,反喷,逆流冲洗,反向洗涤back tenter小型拉幅机back sizing背涂back a note签名于票据背面