技术提示：如何在手机上阻止位置跟踪 Smartphones have become valuable tools for helping to organize our lives.

扩展、扩大等等。 This week on Ask a Teacher, we answer a question from Ann in China.

如何“端上”好东西 And now, Words and Their Stories, from VOA Learning English.

赛珍珠：首位获得诺贝尔文学奖的美国女性 The year was 1931.

研究人员利用化学检测和人类嗅觉研究古代遗骸 A recent study about the smell of Egyptian mummies reached some surprising findings.

如何降低空气质量差带来的风险 Air quality differs from place to place and day to day.

什么是极地涡旋天气系统？ Weather experts say extreme cold in many parts of the United States this winter has been driven by a polar vortex.

航天机构报告称2032年小行星撞击地球的风险增加 Scientists say the threat of a large space rock striking the Earth in 2032 has increased.

帝国大厦：曾经的世界最高建筑 The Empire State Building remains a popular place to visit in New York City.

费城：一座以历史闻名的城市 Philadelphia, also sometimes called Philly, is a big city on the Delaware River in the northeastern state of Pennsylvania.