氢密度

英语听力：探索发现科学新发现：我们的大气层-25

One day these manned space missions may reach out even further to distant planets with alien atmospheres, atmospheres that may support their own life forms. Else where in our universe on distant planets, alien air may support extraterrestrial life. J

发表于:2018-12-03 / 阅读(34) / 评论(0)

探索与发现2014年

Uses Hydrogen1 as Fuel2

Broadcast: February 14, 2003 By George Grow This is the VOA Special English Environment Report. President Bush has offered a plan to speed development of technology that uses hydrogen as fuel. His goa

发表于:2018-12-07 / 阅读(74) / 评论(0)

VOA2003（上）-科技导航

我们该选择死亡吗？

I am speaking not as a Briton, not as a European, not as a member of a western democracy, but as a human being, a member of the species Man, whose continued existence is in doubt. The world is full of conflicts: Jews and Arabs; Indians and Pakistanis

发表于:2018-12-12 / 阅读(54) / 评论(0)

英语演讲

英语听力文摘 English Digest 484、漂浮的热气球

Why is it that you cant put down hydrogen gas? If you had a big balloon full of hydrogen gas, like the first gondola balloons pioneered in 18th-century France, youd find that it rises in the air quite dramatically. You know that a piece of wood will

发表于:2019-01-26 / 阅读(42) / 评论(0)

英语听力文摘 English Digest

雅思单词前缀整理

PREFIX 1.a-:of;on;intensive;negative,not,without;ad-;ab-. 2.ab-:away from,off. 3. ad-:to;at;for. 4. aer(o)- :relating to air . 5.al-:all. 6.ambi-:on both sides,around. 7.amphi-:on both sides,around. 8.an-:negative,not,without. 9.ana-:upon,up,on. 10.a

发表于:2019-02-06 / 阅读(100) / 评论(0)

雅思英语

我们该选择死亡吗

December 30, 1954 I am speaking not as a Briton, not as a European, not as a member of a western democracy, but as a human being, a member of the species Man, whose continued existence is in doubt. The world is full of conflicts: Jews and Arabs; Indi

发表于:2019-02-09 / 阅读(45) / 评论(0)

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学英语单词

3-HAO

annings

antenna power

associated components

border of relative dullness

boy-scouts

cache block replacement