closed end

例句：

1. 1.The pipe is closed at both ends for safety reasons.
   为了安全原因，这个管道在两端都关闭了。
2. 2. The project has a closed-end fund to support its operations.
   该项目有一个封闭式基金来支持其运营。
3. 3.The company's financial performance was closely monitored by the closed-end investors.
   公司的财务状况由封闭式投资者密切监控。