“气球”宇宙飞船使用水力向太空推进,成本大约是普通宇宙飞船的三十分之一。
The "Balloon" spaceship uses water to push it through space and costs about one-thirtieth of a normal spaceship.
木星的光照程度只有地球的三十分之一,土星为八十分之一,天王星甚至达到三百分之一,而离太阳最远的那些星体,如1845年发现的海王星,光照程度只有地球的九百分之一。
On Saturn, eighty times. On Uranus, even three hundred times; and upon the last of the planets, Neptune, discovered in 1845, light is nine hundred times more feeble than upon our globe.
一弧秒的移动是一毫米的三十分之一。
One second of arc movement is one thirtieth of a millimetre.
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