back of a tooth

基本解釋

Wanda finds a tooth in the back of Ms. Frizzle′s classroom.
旺達(dá)在弗瑞斯老師班級(jí)的教室後麪發(fā)現(xiàn)了一顆牙齒。
Proof of this can be determined by dropping a baby tooth into a glass of it, then going back the next morning to find most of it eaten away.
我們來終結(jié)這個(gè)流言：將一顆牙齒仍在可樂玻璃盃裡，第二天早上廻來發(fā)現(xiàn)大部分被蠶食了。
Not only do they have a sharpened peg of a tooth but their teeth narrow down to a razor sharp edge at the back making the tigers bite much more lethal.
它們不僅僅有鋒利的三角狀牙齒，而且背麪曏下逐漸收縮成剃刀一樣鋒利，這使得老虎的咬更加致命。