After a while of living on the surface, they realized our sun was causing them to age prematurely, so they escaped underground, building huge subterranean complexes in which to live.

• 在地表生活一段时间后，他们意识到我们的太阳正引发他们老化，因而他们逃到地下，建造了生活其中的巨大的地下联合体。