他们应该侧重于修整现有的绿化植被，比如草和灌木。They should concentrate on rejuvenating the existing vegetation, like grass and shrubs.树木环绕、精心修整的草坪carefully tended lawns set in a girdle of trees我们须把下沉的地方修整一下.We need to do something about the sa...
The Breguet - Richet Quadrotor helicopter Gyroplane No.1 built in 1907 is reported to have lifted into flight.据报道,1907年,Breguet-Richet四旋翼直升机“旋翼机1号”已经飞了起来....