氟氧化铬(VI) {二氟二氧化铬}

英语专业四级听写020

Passage 20 Waves How does light get from the sun to the earth? How does music get from the stage to the audience? They move the same way in waves! Light and sound are forms of energy. All waves carry energy, but they may carry it differently. Light

发表于:2018-11-30 / 阅读(124) / 评论(0)

英语专业四级听写

国家地理-2008-05-15 Earthquake 地震的危害

April 18, 1906, California's San Andreas Fault snaps, shaking San Francisco for nearly 60 terrifying seconds .When the trembling stops, the disaster is only beginning. Gas lines rupture, setting off massive fires, some 700 people die. Most of the ci

发表于:2018-12-30 / 阅读(35) / 评论(0)

国家地理2008年

Earthquake1 Warning System

Broadcast: May 16, 2003 By George Grow This is the VOA Special English Environment Report. Scientists in the United States have developed a computer program that they say could provide an early warnin

发表于:2019-01-02 / 阅读(40) / 评论(0)

VOA2003（上）-科技导航

每日一词【1023】heat wave：热浪，高温天气

今天我们要学的词是heat wave。 Heat wave, 热浪，高温天气。 A heat wave is sweeping the Northeastern region of the United States, 美国东北部地区普遍出现高温天气。 The heat wave could be a record-breaker, 这次高温天气

发表于:2019-01-07 / 阅读(72) / 评论(0)

英语每日一词

VOA慢速英语2011--The Ever-Present Threat of Tsunamis

SCIENCE IN THE NEWS - The Ever-Present Threat of Tsunamis BOB DOUGHTY: This is SCIENCE IN THE NEWS in VOA Special English. Im Bob Doughty. FAITH LAPIDUS: And Im Faith Lapidus. This week, we tell about tsunamis -- the deadly sea waves often caused by

发表于:2019-01-12 / 阅读(44) / 评论(0)

2011年VOA慢速英语(六)月

【英语时差8,16】地震波如何确定地震的速度和方向-下

And the direction the crystals are pointing makes a difference to the speed seismic waves travel through the rock: a wave traveling parallel to the crystalsin other words, along the length of the toothpickmoves faster than a wave traveling in the oth

发表于:2019-02-15 / 阅读(34) / 评论(0)

英语时差8，16

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bacillus liquefaciens parvus