space-like surface [相对] 类空曲面
weakly space-like surface 弱类空曲面
space-like surface element [相对] 类空曲面元素
Space can have positive curvature, like the surface of a sphere, or negative curvature, like the surface of a saddle.
空间可以向球面一样有正的曲率，也可以像马鞍面一样有负的曲率。
Sunglint is caused by sunlight reflecting off the water surface-much like a mirror-directly back towards the astronaut observer on the Space Station.
太阳反辉区是由于照射在如同镜面的海水表面的阳光直接反射到空间站上宇航员的观测仪器中而形成的。
This artist's depiction shows a possible Earth-like planet with a rocky surface, oceans and an atmosphere. See more space tourism images.
模拟图描绘了类地行星，有岩石表面、海洋和大气。
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