Emergency conditions may dictate at least the initial use of trench latrines. 緊急情況下,可能必須開(kāi)始使用坑道廁所。
The geoisotherms around a gallery can be explained as a superposition of the original temperature field. 一個(gè)坑道周?chē)牡葴鼐€(xiàn)可以理解為原始溫度場(chǎng)的疊加。