評論
打印
Mercury
水星
Which planet is the closest to the sun in the solar system?
太陽系中哪顆行星離太陽最近？
It is Mercury. It is also the smallest planet in the solar system.
水星。它也是太陽系中最小的行星。
How small is Mercury?
水星有多小？
It is slightly bigger than the moon.
它僅比月球大一點點兒。
Even though it is small, Mercury is visible from the Earth.
即使它很小，我們仍能從地球上看到它。
In the early morning and at twilight, we can see Mercury.
在清晨和黃昏，我們可以看到水星。
From the Earth, Mercury looks bright.
從地球上看，水星很明亮。
Then is Mercury the warmest planet?
那么水星是最暖和的行星嗎？
No, it is not. Mercury takes 59 days to make one rotation.
不是。水星的自轉周期是59天。
And its orbit is not circular.
它的軌道也不是圓形的，
Therefore, some parts of Mercury don't face the sun for a very long time.
所以，水星的一部分很長一段時間內照不到太陽。
