22. This might help prevent flooding, but it would also affect the mud flats—those areas of mud that normally are exposed when the tide recedes.

这也许有助于防洪，但它也会影响泥滩，退潮后，那些泥滩一般是暴露在外的。

At last they reached the yoke of the hills, and before them opened another valley, green and wild, and beyond it more blue heights eddying away to the sky like the waves of a receding tide.

终于，他们到达了群山的轭部，在他们面前出现了另一个山谷，绿色而荒凉， 越过山谷，更多蓝色的高地像退潮的波浪一样卷向天空。