More recent geologic studies documented deglaciation and the existence of ice-free areas throughout major coastal areas of British Columbia, Canada, by 13,000 years ago.

更多近期的地质研究证明了13000年前的冰川消退现象和整个加拿大不列颠哥伦比亚省主要沿海地区内无冰区的存在。

youdao

The P is for protecting people by establishing smoke-free areas.

P是指建造无烟环境来保护人们的健康。

youdao

But it's a long and windy road ahead to get proper smoke-free areas in the city.

但是想让这座城市成为一个无烟城市还是一段很漫长和艰辛的路程。

youdao

This is especially true in cloud-free areas of the Pacific.

VOA: special.2009.09.29

People from malaria-free countries who visit areas with high rates of malaria are also very much at risk.

VOA: special.2010.04.20

It will free the slaves, but only in areas where Lincoln has no power.

VOA: special.2010.05.10

The duty-free areas at the airport have as many as ten such raffles a month.

FORBES: PROSPERING THE LASTING WAY

Another factor may have been the army's success in driving the FARC guerrillas, the biggest kidnappers, to remote, hostage-free areas.

ECONOMIST: How mobile phones may help to deter kidnaps

Will there be fewer car-free areas in 50 years' time?

BBC: Will 'bold' cycle safety report stop deaths?