金星上的一天比一年长_英语科普

金星上的一天比一年长

文章来源：未知文章作者：enread 发布时间：2020-03-18 07:14 字体： [大中小]　进入论坛

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关于一年的定义是一个星球围绕太阳旋转一周需要的时间。而一天是这个星球自转一周所需要的时间。

The scientific definition of a year is the amount of time it takes for a planet to make one revolution around the Sun. Earth’s neighbouring planet, Venus, takes 225 Earth days to revolve¹ around the sun. The definition of a day is how long it takes for a planet to do one complete rotation² on its own axis³. It takes Venus 243 Earth days to do this. In other words, a day on Venus is longer than a year on Venus. The rotation of Venus on its axis is retrograde. It rotates in the opposite direction of Earth and the other planets in the Solar System (Uranus⁴ spins on its side).

The main interesting fact in this report is that Venus’s day is longer than its year.

The scientific definition of a day is the amount of time it takes for a planet to do a full rotation on its axis.

The report mentions Uranus because it is another planet that spins on its axis in a unique way. Venus spins backwards⁵ and Uranus spins on its side.

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收听单词发音

1 revolve
vi.(使)旋转；循环出现
参考例句：
The planets revolve around the sun.行星绕着太阳运转。 The wheels began to revolve slowly.车轮开始慢慢转动。

2 rotation
n.旋转；循环，轮流
参考例句：
Crop rotation helps prevent soil erosion.农作物轮作有助于防止水土流失。 The workers in this workshop do day and night shifts in weekly rotation.这个车间的工人上白班和上夜班每周轮换一次。

3 axis
n.轴，轴线，中心线；坐标轴，基准线
参考例句：
The earth's axis is the line between the North and South Poles.地轴是南北极之间的线。 The axis of a circle is its diameter.圆的轴线是其直径。

4 Uranus
n.天王星
参考例句：
Uranus is unusual because it is tilted.天王星非常特殊，因为它是倾斜的。 Uranus represents sudden change and rebellion.天王星代表突然性的改变和反叛。

5 backwards
adv.往回地，向原处，倒，相反，前后倒置地
参考例句：
He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。 All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。

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