I tried to reach the foot brakes but I couldn't.我试图去够脚刹，但是没能踩到。He lost a foot when he was struck by a train.他给火车撞伤，失去了一只脚。My hobbies are letter writing, foot-ball, music, photography, and tennis.我的业余爱好是写信、踢足球、听音乐、玩摄...
实验者已经成功控制了心跳的速度和频率。Experimenters have succeeded in controlling the rate and regularity of the heartbeat.当实验者在自己身上重复测试时，他们观察到了完全相反的效果。When the experimenters repeated the tests on themselves, they observed an exactly oppos...