Semimajor
axis(椭圆的)半长轴
🗣️ 情景例句
I haven't had a minute to relax all day.
我今天连一分钟都没休息。
How did you sign the letter?Did you write, sincerely yours?
你怎么签名信的?你写了"真诚地你的"？
I haven't met him yet.
我还没见过他。