但是打通矿井的紧急救援人员说，他们在井口留下一个梯子，如果矿工决定夜间离开，他们可以使用这个梯子。
But emergency crews who unblocked the shaft said they had left a ladder at the site for other miners to use if they decide to leave overnight.
中国对能源有巨大的需求，通过开采尽可能多的矿井，计划大幅增加风力发电、使用天然气以及建设核电站和更多的煤炭发电站，它才能得到满足。
with planned big increases in wind power and in gas as well as the nuclear build-out and ever more coal-fired plants.
根据矿井通风机的特性，使用变频器进行转速调整以达到调节风量的目的，且有很好的节能效果。
The use of frequency convert to regulate the speed of rotation according to the character of mine fan can reach the goal of the modulation of air flow and have a very good effect of saving energy.
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