wellhead cap

例句：

1. 1. The wellhead cap is designed to protect the well from damage.
   井口盖的设计是为了保护井不受损害。
2. 2.The wellhead cap was installed to prevent water leakage.
   井口盖的安装是为了防止漏水。
3. 3. The wellhead cap needs to be replaced regularly to ensure safety.
   井口盖需要定期更换以确保安全。