Serrasoid
锯齿波(调制)
🗣️ 情景例句
What kind of personality do you think you have?
你认为你具有哪种性格？
He has been to America.
他去过美国。[曾经有过的经验]
Sam and Lin Tao meet outside the school gate.
山姆和林涛在校门口相遇。