Material Movement and Pull System 物料运动和拉动系统
The pull system produces only the required material after the subsequent operation signals a need for it.
根据下一步操作发出需要的信号拉动系统只会生产恰好多的原料。
Those in a binary star system may have a strong enough gravitational pull to gather in material from a neighboring star.
那些双星系统中的白矮星可能有足够强大的引力，能从伴星上吸聚物质。
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