干净: clean, neat...
乐器: musical instrument...
退让: to move aside, to get out of the way, to back down, to concede...
学年: academic year...
提速: to increase the specified cruising speed, to pick up speed, to speed up...
裹: to bind, to wrap, a bundle, a parcel...
敌人: enemy...
损害: harm, to damage, to impair...
加强: to reinforce, to strengthen, to increase...
详尽: thorough and detailed, exhaustive, the tedious details in full...
