1. The tiles on the roof overlap one another. 房上的瓦是一块搭著一块的.
2. This boost in reaction time after exercise training may occur because declines associated with getting old could actually stem from declines in physical condition. 接受运动训练之后,人的反应速度会加快,这可能是因为与衰老有关的机能衰退实际上根源于体质下降。