So the instrument not only convenient for mineworker, but effective guarded against the fire damp explosion in practice ap...
不但方便了井下工人的随身携带,而且有效地预防了安全事故的发生。
So the instrument not only convenient for mineworker, but effective guarded against the fire damp explosion in practice ap...
不但方便了井下工人的随身携带,而且有效地预防了安全事故的发生。
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