英语语法分析

Aft Unpressurized Compartment Access Door, 311bl.

打开后非增压舱接近门，311bl。

Two air conditioning packs are installed in the unpressurized area in the belly fairing.

两部空调组件安装在机腹整流罩内的非增压区域。

The design adopt the heavy medium Preparation technique, and its main equipments are three-product dense medium cyclone by unpressurized feeding.

本设计采用重介选煤工艺，其主要设备是无压给料三产品重介质旋流器。