Strobolamp
旋光试验灯
🗣️ 情景例句
How old are you, Gerald?
Gerald，你今年多大啦！
He hasn't answered my letter yet.
他还没有给我回信。
How much did you pay for all these things? asked her mother.
“买所有这些东西你付了多少钱？”她妈妈问。