单词：polarization cell
单词：polarization cell 相关文章
At lunch the guests at the Black Dog Inn could talk of nothing but the museum robbery. If you ask me, one guest said, the police should question Miss Coffin first. After all, she lives at the Sailors Museum. Humph! another guest said. What about inve
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The biggest and strongest animal on land is the elephant. The largest and heaviest animal in the sea is the whale. It's also the biggest eater in the world. It eats a ton of food a day. It looks like
赖世雄初级美国英语
It really is rocket scienceresearchers are using huge x-ray scanners from NASA to understand how sonar might be affecting the hearing of large ocean mammals. These scanners are usually used to inspect the space shuttles solid fuel rockets. Navy sonar
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Then as we got closer, I could see what it was. It was a California gray whale cow. The California gray whale is one of the largest animals on the planet. A fully-grown female known as a cow can easily weigh up to 35 tons, the equivalent of eleven fe
国家地理2007年
EXPLORATIONS - November 27, 2002: Keiko the Whale By Jerilyn Watson VOICE ONE: This is Mary Tillotson. VOICE TWO: And this is Steve Ember with the VOA Special English program EXPLORATIONS. Today we te
Explorations
NASA Scanner Offers Clues To Whale Hearing Researchers at UC San Diego and San Diego State University have imaged whale skulls in an attempt to determine the effects of sonar on whale hearing. Cynthia Graber reports It really is rocket scienceresearc
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