Conics
n. 锥线法, 锥线论
🗣️ 情景例句
Add a teaspoon of oil and one cup of milk.
加一茶匙油和一杯牛奶。
He emerged as leader at the age of thirty.
他在30岁时出人头地成为领袖。
The people performing all play different instruments and three of them sing too.
参加演出的人都要演奏不同的乐器，其中三位也演唱。