By and by attention ceased from him, and the accustomed school murmur rose upon the dull air once more.

渐渐地，大家的注意力不再集中在他身上，学校里惯有的低语声又在沉闷的空气中响起。

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In the parking lot of the school, the siren filled the air.

学校的停车场上，警报响彻天空。

《柯林斯英汉双解大词典》

Get off a stop earlier, make a circuit of the park at lunchtime, walk the child to and from school, get a dog, feel yourself moving in moving air, look, listen, absorb.

提前一站下车，午餐时间去公园转一圈，带孩子上下学，养条狗，感受自己在流动的空气中移动，观察，倾听，吸收。

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(OMITTED) Remais,an assistant professor at Emory University's Rollins School of Public Health in Atlanta, He says the growing economy is fueling environmental risks such as air pollution and chemical toxins, while age-old environmental challenges remain.

VOA: standard.2010.04.07

Suddenly, he remembered how he had to hold two water buckets up in the air in primary school, along with the faces of the headmaster and his homeroom teacher.

NPR: Literature and Lullabies from the 'Axis of Evil'

The Air Force Weapons School provides advanced training for a handful of elite officers each year in traditional skills, like teaching aerial combat, reconnaissance and bombing, and also for the growing ranks of drone pilots.

WSJ: Pentagon Digs In on Cyberwar Front

Sales of everything, from school satchels to air-conditioners, are at a trickle, and the newspapers are full of advertisements for zero-interest, no-deposit luxury flats.

ECONOMIST: Egypt