Semimajor axis
（椭圆的）半长轴
🧩 词语组成解析
axis(椭圆的)半长轴
🗣️ 情景例句
The little boy held his mother's hand firmly when crossing the street.
那小男孩过马路时紧抓着母亲的手。
He who despises small things seldom grows rich.
小钱不计，大钱不聚。
Most of the parents will not be able to pay much money.
多数家长是付不起很多钱的。