1. Modern farm machines such as tractors, harvesters and threshers have replaced yaks that were used for cultivation and shelling in the past. 昔日“二牛抬杠”种地,牦牛踩场打麦的传统生产方式,逐渐被轰鸣的拖拉机、收割机、脱粒机等现代农机所代替。
2. These massive fish (the wingspans of Maldives mantas can reach 12 feet) are dynamic filter feeders, shoveling their shoe-box mouths through krill like threshers through wheat, inhaling prey. 这种大型鱼类(马尔代夫蝠鲼翼展可达12米)是动态的滤食者,它们的大嘴吸入食物就如同向小麦脱粒机里铲麦子一般。