Instantaneous center(of rotation)
[化] (转动)瞬心
🧩 词语组成解析
🗣️ 情景例句
He's had so many colds and sore throats recently.
他最近常常感冒喉咙痛。
You must go to the moon. It's your duty.
你必须上月球去，这是你的职责。
Hello, Jim! How are you?
吉姆，你好吗？