Day40 are there jewels in the sea？

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英语百科Day40：Are there jewels in the sea? 

In warm tropical water, pearls may grow inside the shells of oysters and clams. The pearls are such rare finds that they are very valuable. People risk their lives diving down for them.

 1.jewel：珠宝

 2.tropical：热带的 

3.pearl：珍珠 

4.oyster：牡蛎 

5.clam：蛤蜊

 6.valuable:有价值的；贵重的