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At present there are two narrow lifelines drilled, one for communication and one for food supplies.
目前已经挖通两条生命线, 一条用于通讯,另外一条用于食物供给.
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He will be linked to the spacecraft by two lifelines that will supply oxygen and communications.
两条输送氧气,保证通讯的生命线将他和飞船连在一起.
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So I will convene a White House summit aimed at strengthening these lifelines of learning.
为巩固这些学习的生命线,我将召集一次白宫高峰会议.
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