Sinuidal
正弦波; 正弦形
🗣️ 情景例句
I'm taking 19 credit hours.
我修了十九个学分。
My son wants to be a policeman when he grows up.
当他长大时，我的儿子想要成为一个警察。
We're having trouble meeting your shipping schedule.
要如期出货，我们有问题。