blocking of PIUs

例句：

1. 1. The engineer found a significant blockage in the pipeline that needed immediate attention.
   工程师发现管道中存在一个重大堵塞，需要立即关注。
2. 2. The company's new policy aimed to block any unauthorized access to sensitive data.
   该公司的新政策旨在阻止任何未经授权访问敏感数据的行为。
3. 3. The government has implemented a blockade to prevent illegal trade in drugs.
   政府已经实施了一项封锁措施，以防止非法毒品交易。