The visitors come to ride white-water rapids and zoom along zip lines that have been constructed all around the valley.

游客前来乘坐激流， 沿着山谷周围建造的高空滑索滑行。

Far off there was a sound which might have been beating surf or cars zooming along a highway, or wind in pine trees.

远处有一种声音， 可能是拍打海浪的声音， 也可能是汽车在高速公路上飞驰的声音， 或者是风吹过松树的声音。