He nodded mechanically, his eyes fixed on the girl.他机械地点点头，眼睛直勾勾地盯着那个姑娘。The air was circulated mechanically.空气循环是靠机械驱动的。The car was mechanically sound, he decided.他断定，这辆车的机械性能非常可靠。...
footprints in the sand沙地足迹He squatted down beside the footprints and examined them closely.他蹲在脚印旁仔细地观察.I did a little sleuthing to see if I could find any footprints.为了看能否找到什么脚印，我做了一番小小的侦察。...