that threatens to render the US$40 billion stealth B-2 bomber fleet obsolete by making the planes... and can get away.The passive radar listens to low-frequency radio waves and uses high-speed computers ……

. The ferry glided (滑动) through the water, sending ribbons of waves and gentle ripples (涟漪) through the sea... the air a pleasant harmony.The University of Sydney was another haven. It was where the famous Harry ……

. The ferry glided (滑动) through the water, sending ribbons of waves and gentle ripples (涟漪) through the sea... the air a pleasant harmony.The University of Sydney was another haven. It was where the famous Harry ……

waves, which are waves of high and low pressure that travel through a medium (媒介) such as air, can... pea-sized objects using strong sound waves made by 64 mini-loudspeakers around the objects ……

to Norway, home of skiing, and breathe in the mint-fresh air as you enjoy a workout among the pine... and, by the end of the week, you could be making mini-expeditions of 24 kilometres or more.SurfingThe warm ……

", as the Mexicans call it, featured widely on TV.While Mexicans will no doubt be making waves... of sports events, sections of a stadium crowd will suddenly stand up, wave their arms in the air, roar ……

the air.According to scientists, sound waves travel faster through materials with greater density (密度... km per second. TUCHONGSound usually travels at 340 meters per second in the air. But scientists ……

Thanks to Earth, we have fresh air to breathe, clean water to drink and warm sunshine to enjoy... planet is getting “sick”. Thanks to Earth, we have fresh air to breathe, clean water to drink ……

light waves — green and blue — have been scattered (散射) away by particles (微粒) in the air.What's left... (灰尘) and pollution in the air.Usually, when the moon becomes orange, it's close to Earth. When ……

US billionaire Jared Isaacman waves after SpaceX’s Dragon spacecraft landed on Sept 15.  AFP... SpaceX’s new space suits (航天服). They are lighter than the old ones and astronauts can get air and energy ……

and the strong nuclear force), gravity is relatively *feeble, making gravitational waves hard... of space-time and *propagated outward in *gravitational waves.Then, on Sept 14, 2015, a group ……

province. From mid-March to late April, the spring air in Lijiang is sweet with the fragrance (香气... the fruit in large glass jars, making the most gorgeous (华丽的) of sights. The lovely bright red cherries ……

人类，地球真的已经很脆弱了。Thanks to Earth, we have fresh air to breathe, clean water to drink and warm sunshine.... It means that heat waves would last around a third longer and rainstorms would be about a third more ……

a competition and more like a recreational (休闲的) activity. Also, there’s a certain air of gentleness in this sport, making it quite beautiful to watch.Dong Yinuo, 16:Rock climbing is what I expect to see ……

难度：简单字母a发音/eI/Jake’s taleThis is Jake.Jake makes waves (波浪).A whale is in the waves.Is Jake safe?Yes, a whale came to play.Whales make big waves.They like the same game. ……