单词：extinguisher with high expansion of foam
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[00:00.00]4 Did you go on vacation? [00:08.87]Yes,I did. [00:10.14]Where did you go? [00:11.51]I went to France. [00:12.97]Which city did you visit? [00:14.78]I visited Paris. [00:16.44]What did you see? [00:17.92]I saw the Eiffel Tower and the Arc d
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This is Scientific Americans 60-Second Science, I am Cynthia Graber .This will just take a minute. How can we improve engines, inhalers and fire extinguishers? Maybe by copying a beetle. The bombardier beetle's name might scare off predators if they
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By Mike O'Sullivan Palmdale, California 06 September 2006 Engineers in the California desert are testing a new communications platform that blends modern electronics with old technology. Developers say a helium-filled balloon carrying high-tech equi
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August 26th, 1920The 19th Amendment to the US Constitution takes effect giving women the right to vote. Carrie Chapman Catt is one of the leaders in the women`s suffrage movement. Woman Suffrage is a long story of hard work and heartache, at least on
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August 26th, 1920The 19th Amendment to the US Constitution takes effect giving women the right to vote. Carrie Chapman Catt is one of the leaders in the women`s suffrage movement. Woman Suffrage is a long story of hard work and heartache, at least on
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China will have a bright new railway services timetables from Sunday. It is the largest expansion in decades involving extensive regions and a range of trains. Beijing Railway Bureau said the capital will run 30 more services, leading to a record hig
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