杰克有嗜好象牙雕刻品的缺点。
在上世纪70年代末和80年代初，对非洲稀树大草原大象的杀戮呈现激增态势，很重要的原因来自于亚洲对象牙雕刻品的不断增加的需求。
In the late nineteen-seventies and early eighties, there was a spike in the killing of Africa's savanna elephants, caused largely by increased demand in Asia for ivory carvings.
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