全民英檢 | 學測/指考 | 國中會考
參考詞彙 初級中級中高級
Each of the planets in the solar system circles around the sun in its own , and this prevents them from colliding with each other.
[動詞] 繞軌道運行; [名詞] 運行軌道
Congratulations!
Oops! 正確答案是 orbit
