the annual seal cull每年对海豹的选择性宰杀It is usually good practice to cull the poorest prior to field planting.通常在实践上的好方法是在出圃栽植前挑出最弱的苗木.Said Dr. Cull to the high school students touring the laboratory.卡尔博士对前来参观实验室的高中生们说....
他给他演示如何吹奏象牙吹口乐器。He showed him how to blow into the ivory mouthpiece.象牙海岸成为世界上可可粉的主要产地。The Ivory Coast became the world's leading cocoa producer.象牙磨损的速度快于生长的速度。Elephants wear the tusk down faster than they can grow i...