在Given部分，罗列出前提条件，测试环境，测试输入以及系统状态。
In the "Given" section, list the preconditions, test setup, test inputs, and system state.
飞行员在黑暗条件下飞行并到达模拟环境，在海豹队员用速降绳降落的时候飞机处于悬停状态。
The pilots flew in the dark arrived at the simulated compound and settled into a hover while the SEALs fast-roped down.
并得出在采样气体状态参数和环境条件一定时，除尘效率的测定误差主要取决于取样时间及流量。
Under a definite gas state parameter and environment condition, the measurement deviation was correlated with the sampling time and the flow rate.
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