plummer block cover

例句：

1. 1.The puzzle was solved with the help of a plummer block cover.
   通过拼图块覆盖物的帮助，这个谜题被解开了。
2. 2. The children were playing with their plummer block covers.
   孩子们正在用他们的拼图块覆盖物玩耍。
3. 3.The teacher used a plummer block cover to explain the concept of gravity.
   老师使用拼图块覆盖物来解释重力的概念。