They are not working quietly; they are playing.

他们没有安静地工作；他们在玩。

同一单元的其他句子

• Please work quietly in the library.请在图书馆里安静地工作。
• Are you working quietly now?你现在安静地工作吗？
• Don't talk loudly during class.上课时不要大声说话。
• The students are working quietly on their tests.学生们正在安静地做测试。
• Can you work quietly for ten minutes?你能安静地工作十分钟吗？