Semimajor
axis(椭圆的)半长轴
🗣️ 情景例句
You would be well-advised to book in advance.
你还是提前预订较为稳妥。
United's Flight 102 leaves at 9:20.
联合公司的102次班机9点20分起飞。
for it is then almost ready to undertake heavy work and can begin to earn its keep straight away.
这个年龄的象差不多已能干重活，可以很快挣回饲养它的开支。