Luffing
俯仰运动, 上下摆动, 起重机臂的转动
🗣️ 情景例句
Tom doesn't enjoy going to school.
汤姆不喜欢上学。
Every man has his weak side.
人人都有自己的弱点。
I'm sorry to hear that. I hope you're better now.
听说你病 了，我心里很不好受。我希望你现在好些了。