上课铃声响后，请立即进教室就座并保持安静。
Must enter classroom, be seated and be quiet when the bell rings.
如果你是一个老师，每次上课铃声响时，放松呼吸吧。
If you're a Teacher, take a breath each time the school bell rings.
T：如果你是一个老师，每次上课铃声响时，放松呼吸吧。
T: If you're a Teacher, take a breath each time the school bell rings.
我女儿上课迟到了，铃声响了一会才到。
My daughter, who was late for class, arrived shortly after the bell rang.
铃声响了，让我们上课。
铃声响了，让我们上课。
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