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。
If the universe's space-time is positively curved, like the surface of a sphere, parallel beams would come together.
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。
Sunglint is caused by sunlight reflecting off the water surface - much like a mirror - directly back towards the astronaut observer on the Space Station.
太阳反射区是由于阳光照射水面——就像一面镜子——直接反射到空间站宇航观测。
The space uniformity of spontaneous emitation from the surface of sample is like that of the incident light.
从样品表面出来的自发发射的空间均匀性似乎与入射光一样。
The process of VP-like cells in PVN, PN, AN and POM projected towards the third ventricle, and the process in SON towards the glial lamina in the basal surface of the brain or subdural space.
同时发现室旁核、室周核、室周弓状核及视前大细胞核的VP阳性神经元有突起伸入到第三脑室室管膜或突出于脑室腔，视上核的VP阳性神经元也有突起投射至脑基底神经胶质板上或伸至蛛网膜下腔。
The process of VP-like cells in PVN, PN, AN and POM projected towards the third ventricle, and the process in SON towards the glial lamina in the basal surface of the brain or subdural space.
同时发现室旁核、室周核、室周弓状核及视前大细胞核的VP阳性神经元有突起伸入到第三脑室室管膜或突出于脑室腔，视上核的VP阳性神经元也有突起投射至脑基底神经胶质板上或伸至蛛网膜下腔。
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