隧道加深一米需要1天的时间，而浇铸混凝土墙壁和拱顶需要3天多的时间。
The tunnel deepening for 1 meter takes one day. Three days more - for concrete casting of the walls and the arch.
记录试棒浇铸的准确时间，并在光谱化学成分上标出。这样才能做到化学成分和物理性能的准确对应。
Record the exact pouring time of test bars, and mark on the chemical composition spectrum analysis. so that chemical composition and mechanical performance can match exactly.
记录试棒浇铸的准确时间，并在光谱化学成分上标出。这样才能做到化学成分和物理性能的准确对应。
Record the exact pouring time of test bars, and mark on the chemical composition spectrum analysis. so that chemical composition and mechanical performance can match exactly.
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