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[化] 三节四极质谱仪
🗣️ 情景例句
All right, ladies and gentlemen.
好啦， 女士们， 先生们。
I told him to stay for supper.
我告诉他留下来吃晚餐。
I suggest that you did not catch the 8 o'clock train,
您乘的不是8点钟的火车，