straight line pen 中文意思是什麼
straight line pen
解釋
直線筆-
If the earth was not there, the moon would travel in a straight line, that is, fly away. the earth and the moon attract each other, so the moon falls to the earth, just like a pen does
由於地球和月球互相吸引,月球便向地球靠攏,月球不斷向地球方向落下,而落下的距離剛好和月球飛離地球的距離抵銷,結果月球便能夠以接近圓形的軌道繞著地球運行。
分享友人