免费日韩片_欧美成人精品一区二区男人小说_国产乱码一区二区三区四区_国产精品国产三级国产aⅴ入口_成人看的污污超级黄网站免费_欧美一级在线免费观看_成人午夜免费无码福利片_国产乱人伦偷精品视频色欲_aaa少妇高潮大片免费看_国产精品1234_亚洲精品国产suv一区88_中文字字幕在线中文无码_精品亚洲区_午夜九九九_国产av国片精品jk制服丝袜_色综合亚洲_亚洲成av人片无码bt种子下载_欧美色就色_精品少妇的一区二区三区四区_男人用嘴添女人下身免费视频

有一件東西是我們天天都要看的，猜猜是什么？答案是——時(shí)間！所有鐘表的指針都是從左向右轉(zhuǎn)的，我們管這個(gè)叫順時(shí)針。不過細(xì)心的你有沒有想過，為什么鐘表的指針都是從左向右轉(zhuǎn)？順時(shí)針又是怎么來的？原來，這些都是太陽惹的“禍”。

Mechanical clocks were invented in the northern hemisphere by inventors who were trying to make models of the sun's movement in the sky.

To watch the sun from the northern hemisphere, you have to face south. Then the sun will rise on your left and pass over your head to set on your right. Since the hour hand on the clock was made to follow the sun's motion through the sky, it moves from left to right over the top of the clock - clockwise. The hands are actually modeled after the shadow on a sundial.

hemisphere: 半球

sundial: 日晷儀：指示某地太陽時(shí)間的一種儀器，通過一個(gè)中心突出指針在圍繞刻有標(biāo)準(zhǔn)刻度的日晷上的陰影來指示時(shí)間。

（英語點(diǎn)津 Annabel 編輯）