1. Liquid nitrogen is often used to subcool liquids for various scientific experiments.
液氮常被用来对各种液体进行过冷处理，以进行科学实验。

2. In order to achieve maximum efficiency, the refrigerant in the system needs to be subcooled before entering the expansion valve.
为了达到最大效率，在进入膨胀阀之前，系统中的制冷剂需要被过冷处理。