Farmers thresh grain with threshing machines.农民用脱粒机脱粒.Nowadays most farmers use a machine to thresh their wheat.现在多数农民使用机器脱麦粒.In some villages farmers use a machine to thresh wheat.在一些村子里,农民用机器来打麦....
Petty officers are the backbone of a navy.军士是海军的骨干。Agriculture forms the backbone of the rural economy.农业是农村经济的基础。The wounded soldiers showed much backbone before the enemy.受伤的士兵在敌人面前表现出了威武不屈的精神....