[计] 群速
[化] 群速

group velocity的用法和样例：

例句

The group velocity is the speed at which modulated signals would be transmitted.群速度就是将调制信号发送出去的速度。

TED演讲:如何把熟蛋变生(2)

Here's the key part. 接下来是关键的部分。 The solution nearest the wall spins faster than the solution closer to the middle. 离试管壁最近的溶液，要比中间的溶液旋转得更快。 That difference in velocity creates sheer str

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(LOS ANGELES, AP) Allen Iverson shook up the NBA Finals when he scored 48 points in the opener of the series. （美联社洛杉矶电）亚伦.艾佛森在NBA联赛的第一场比赛攻下48分，震撼NBA的总决赛。 The Philadelphia 76ers stunn

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SSS 2009-04-15

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. It's April 15th. Like many people around the country, you might be feeling your blood pressure rise as you deal with everyone's favorite activityfiling

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This is Scientific American's 60-second Science. I'm Steve Mirsky. Got a minute? Could it be that our understanding of rain was all wet? A new study says that some drops of rain are falling faster than they should be. Which ultimately means that it m

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We have to beat that. 我们必须克服它。 We can do it because in space there are no aerodynamics. 我们能够这样做是因为太空里没有空气阻力。 We can go and use inflatable systems for almost everything. 我们几乎总是能够使

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Clippers win over Pistons 129-97

LOS ANGELES, March 10 (Xinhua) -- Blake Griffin finished with 22 points and eight rebounds, Chris Paul contributed 20 points with 14 assists as the Los Angeles Clippers handed the Detroit Pistons 5th straight defeat 129-97 on Sunday. The 129 points w

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实用英语

Philadelphia guard Richardson undergoes successful knee surgery

WASHINGTON, Feb. 19 (Xinhua) -- NBA's Philadelphia 76ers announced Tuesday that their guard Jason Richardson has undergone successful knee surgery. The 12-year NBA veteran, who has not played for a month and will be sidelined for the rest of the seas

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1．市况上扬: The market advances/ gains /rises. 2．市况下挫: The market declines /falls/loses. 3．市况活跃: The market booms. The market is excited. The market becomes active. The market becomes brisk. 4．市况暴跌停滞: The m

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教师课堂屏蔽手机信号被停职

A Florida high school teacher was suspended without pay on Tuesday for five days for using a cell phone jammer to block students' cell phone service at school. 佛罗里达州一位高中教师于近日因在班里使用信号屏蔽器来阻止学生上

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嫦娥5号探测器今年将带回月球土壤

China's unmanned lunar probe Chang'e-5, set to be launched around December 2017, will bring lunar soil samples back to Earth, says Wu Yanhua, deputy chief of the China National Space Administration. 国家航天局副局长吴艳华近日表示，我国

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Houston Rockets beat Memphis Grizzlies 121-96

HOUSTON, Dec. 22 (Xinhua) -- James Harden scored 31 points and dished out eight assists to lead the Houston Rockets to its 121-96 victory over the Memphis Grizzlies on Saturday. It was the Rockets's 13th straight home win over the Grizzlies, who have

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英语新闻

Guangdong hands Beijing 5th defeat in CBA

BEIJING, Jan. 4 (Xinhua) -- Defending champions the Guangdong Hongyuan handed the Beijing Ducks their second home defeat of this season with a 112-99 win in the 20th round of Chinese Basketball Association (CBA) league here on Wednesday. The Beijing

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经济学人:云巅之上畅想未来交通(下)

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荒野求生

Varejao to miss up to two months

CLEVELAND, Jan. 9 (Xinhua) -- Cleveland Cavaliers' Brazilian center Anderson Varejao will be sidelined in the next two months after it was revealed he needs surgery on his right knee. Varejao suffered the injury during the Cavaliers' 113-99 defeat to

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英语新闻

英语听书《白鲸记》第705期

As an overladen Indiaman bearing down the Hindostan coast with a deck load of frightened horses, careens, buries, rolls, and wallows on her way; 如同一只超载的东印度公司贸易船，甲板上装着许多惊惶失措的种马，正在印度斯

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