这把古董梳子的梳背被雕刻成象牙的形状。
The comb of this antique was carved into the shape of a ___tusk.
大象用象牙刺伤了入侵者的手臂。
The elephant ___tusked the intruder's arm.
大象的象牙很长。
The elephant has long ___tusks.
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