答案

There are two measures to protect the beach from erosion. The first is to construct barriers. People will build construct with cement in shallow water or near shore. The construct is effective in reducing the force of the wave, and therefore decreases the amount of water that reaches the beach. Therefore, there is little possibility that the sand on the beach is washed away into sea. The second is to regularly replace the sand. For example, people will set up a pump near the shore, aiming to pump up the sand in the sea. Therefore, only the sand pumped up from the sea will be washed away into sea, while the original sand on the beach remains. (117 words)