平行光线指的是两束光线共处于一个平面，并且相互平行，一般也认为太阳光是平行光。
每面内的颜色都相同，这是因为光线是平行的。
Within a side, the color stays the same because of the light's parallel rays.
如果宇宙的时空像球体表面一样正向弯曲，平行的光线就会交合在一起。
If the universe's space-time is positively curved, like the surface of a sphere, parallel beams would come together.
该层的所有房间平行布局，因此浴室、卧室、厨房、餐厅和客厅都可以享受到充足的自然光线。
Allthe areas on this floor are arranged in parallel, so that each room enjoys natural light: bathrooms, bedrooms, kitchen, dining and living room.
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