因为在第一类迫降[1]中幸存的几率是极其微小的，实际上就是不可能的。
Because the chances of surviving a first category crash landing are so infinitesimal, they're practically nonexistent!
获得了以该介质为蓄冷媒介的蓄冷平板在第一类边界条件下凝固时的相界面移动规律、板内温度分布及预测蓄冷时间等参数。
The motion of phase interface, the temperature distribution and the thermal storage time of the cool storage slab under the first boundary condition were obtained.
邮局已承诺在星期五恢复该地区第一类邮件的递送。
The post office has promised to resume first class mail delivery to the area on Friday.
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