论文部分内容阅读
Q:在我们周围的空气中,飘浮着许许多多肉眼看不见的病菌和灰尘,它们会不会随着我们的呼吸进入身体中,危害我们的健康呢?
Q: In the air around us, there are so many bacteria and dust that can not be seen to the naked eye. Will they come into the body with our breath and endanger our health?