金属是构建时间传送门的过度元素。
Metal is the (transitional) element for the construction of Artifact Vessels.
兵营可以升级为曲光传送门，这个可以让你传送兵营里可以生产的兵，当然冷却时间也很长。
Your Gateway can be converted to a Warp Gate. They can then warp the same units that they can produce and with a quite long cooldown between each unit.
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