duplex doubleacting pump

例句：

1. 1. The duplex apartment has two separate living spaces.
   这个复式公寓有两个独立的居住空间。
2. 2. The duplex pump is designed to handle high pressure water.
   这种双联泵设计用于处理高压水。
3. 3. Duplex systems are popular for their energy efficiency.
   双联系统因其能源效率而受到欢迎。