Semimajor
axis(椭圆的)半长轴
🗣️ 情景例句
Pleasant dreams.
祝你有个好梦。
What is the total circulation of this newspaper.
这家报纸总发行量多少？
A girl came in and put an envelope on his desk.
一个姑娘走了进来，把一个信封放在了他桌上。