Bowling is a sport in which players attempt to score points by rolling a bowling ball along a flat surface, usually a wooden or synthetic surface, either into pins or to get close to a target ball.
保龄球是一种在平滑球道上用球滚击球瓶从而得分的体育运动，球道通常为木制或合成材料。
2
The landscape is flat, or at most gently rolling.
这里风景单调，大多都是延绵起伏的缓坡。
3
The well-paved surfaces and rolling hills became flat, dusty, pot-holed roads, with mountains never closer than the horizon.