单词：trace metal enrichments
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MARY LOUISE KELLY, HOST: The phrase leave no trace is often used to describe good behavior in national parks, meaning enjoy the scenery, and then leave the park exactly as pristine as you found it. The new movie Leave No Trace is about a father and d
2018年NPR美国国家公共电台7月
[全屏观看] 点击右键- 另存为 可保存这个Flash影片 Description: Metal Sonic is flying through space and comes to an asteroid field, you need to help him blast his way through without getting hit or its game over. Instructions: Move: Up
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By Barbara Schoetzau New York 10 February 2006 Kofi Annan U.N. Secretary-General Kofi Annan is urging Iran to suspend its nuclear activity and allow talks with Russia to move forward. ----------------
2006年VOA标准英语（二月）
By Peter Heinlein New York City 05 October 2007 Runners on the streets of New York are commonplace this time of year. There is the marathon next month, and occasionally, other organized runs. But one annual event has skyrocketed to prominence in rece
2007年VOA常速英语（十月）
By Challiss McDonough Cairo 13 April 2006 Iran's president says he will not halt his country's uranium enrichment program, despite international pressure to do so. U.N. Nuclear Chief Mohamed ElBaradei
2006年VOA标准英语（四月）
TEHRAN, Aug. 15 (Xinhua) -- Iran said on Sunday it will not stop its nuclear fuel enrichment（丰富,改进） activities although Russia would provide it with the nuclear fuel needed to run its Bushehr nuclear power plant. Head of Iran's Majlis ( P
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