随着大象数量的减少，象牙的价格在上涨。
他们应当对北卢安瓜大象数量的大量减少负主要的责任。
They were the ones mainly responsible for the decimation of North Luangwa's elephant population.
1979年，非洲有130万头大象；10年后，大象数量下降了一半。
In 1979, there were about a million three hundred thousand elephants in Africa; ten years later, the population had fallen by half.
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