, from the ground, rain clouds look gray.On sunny days, clouds are good at “bouncing off (弹开)” light...雨天的云为什么会变灰？雨天的云为什么会变灰？On sunny days, clouds are good at “bouncing off (弹开)” light. All the colors ……

't travel too light. It's better to have an extra outfit or two than to be stuck with nothing... or suitcases with wheels are preferable.* You also need a good travel purse that has lots of pockets. So you ……

't travel too light. It's better to have an extra outfit or two than to be stuck with nothing... or suitcases with wheels are preferable.* You also need a good travel purse that has lots of pockets. So you ……

a good helper. Let’s listen to their travel stories.I travel by air起飞啦！I’m a dandelion (蒲公英) seed. My... travel as far as 2,000km. When we find a good beach6, we land on it. It’s our new home.I jump to my new ……

raise your hands.give the green light: to approve of, to give permissionalso: give the go-aheadGrammar note: These idioms do not require a direct object.eg, This boss gave the green light ……

is less appealing to the outside world, at other times it offers a lead many want to follow... Good... what the jokes say they are? We asked our US editor.US tourists - the stereotype: They travel ……

think there is a chance that the planet could have life.Here Teens takes a look at what scientists know... 581g?The planet Gliese 581g goes around a star called Gliese 581, which is about 20 light-years from ……

. They are light and can easily travel to people. 21ST.... They look like giants (巨人) in a smaller world. There are four gallery models. One of them is the Louvre (卢浮 ……

forever. Now that we can travel to space, we dream of finding another home out there. Earth is the cradle (摇篮) of human life. But we might not stay in this cradle forever. Now that we can travel ……

well. I can show you a good way to travel around. We can have a talk about the price."The way he spoke... the depth of my heart as I tried to recall a similar look I had seen years before.One summer vacation, I ……

Star Wars, where glowing beams (闪亮的光束) of light traveling through space look very impressive... spacecraft uses. “It's a good thing they didn't have Norton Antivirus,” jokes Chivers.It's just one ……

for both wide-angle and *telephoto shots,” Atherton told CNN. A good choice would be a slim, light pocket camera with a *decent built-in *optical zoom. “These are very popular for travel as they are light ……

is this: Take a short break from your partner, travel by separate means and don't plan the route... and a half. "It's not only an unusual way to discover a city, but a second look at our love."For newly ……

they travel. This beautiful headdress (头饰) is from Quanzhou, Fujian. Fisherwomen there pin (盘起) their hair up and wear fresh flowers to look pretty. This tradition (传统) is over 1,000 years old. Jasmine ……

standing still.So even if you are moving very fast, light still appears to travel just as fast...Going for light speed我们有可能超越光速吗?Q:Is it possible to go faster than the speed of light ……