Dalembertian
达兰伯算符
🗣️ 情景例句
I hope you like it.
希望你喜欢。
He brushes his teeth.
他在刷牙。
In 1975, a primitive machine called the Altair, was launched in the USA.
1975年，美国推出了一台被称为“牛郎星”的原始机型。