n.古文体
Elephants wear the tusk down faster than they can grow it.
象牙磨损的速度快于生长的速度。
A huge tusk decorated the wall of his study.
他书房的墙上装饰着一支巨大的象牙.
The narwhal's single, spiral tusk has always been a mystery.
独角鲸那独一无二的螺旋状尖角总是被视为神秘之物.