Shells she sells on the seashore are seashells I am sure.
我敢肯定她在海边卖的贝壳是海贝。
With time and patience the leaf of the mulberry becomes satin.
只要功夫深,铁杵磨成针。
Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land.