sunk key

例句：

1. 1. Thelost treasure was found by a diverwho had submerged his key inthe ocean.
   一个潜水员在海里找到了失窃的宝藏。
2. 2. The ship sank, and the crew had to use theirsunk key to open the door.
   船沉没了，船员们不得不用他们的沉入海底的钥匙打开门。
3. 3. Thelost key was finally found by a fisherman who had been searching for hours.
   这个丢失的钥匙最后被一位渔民找到了，他已经找了几个小时了。