句子完整结构为:We often imagine how wonderful it will be to travel to the Mars freely. 我们常常想象自由地去火星旅行将会多么美好。 1. 句子缺少主语,需要用it作形式主语,指代后面的不定式短语to travel to the Mars freely。 2. it作形式主语,真正的主语是不定式短语to travel to the Mars freely。
for it was made of iron and glass.It was one of the biggest buildings of the time and a lot of people from many countries came to see it.A great many goods were sent to the exhibition from various parts of the world.There was also a lot of machinery on show.The most wonderful ...
"It takes the Earth one year to orbit the sun and it takes Mars about 1.9 years (say 2 years for easy calculation) to orbit the sun. The elliptical orbit which carries you from Earth to Mars is longer than Earth's orbit but shorter than Mars' orbit. Accordingly, we can estimate the ...
The distance to Mars from Earth constantly changes as they orbit the sun. The average distance between Earth and Mars is 140 million miles (225 million km).
Let's learn about surviving a trip to Mars.What would it take to keep people safe and healthy on a trip to Mars? Scientists are already working on it though the trip may be many years later.Over the last 60 years,many spacecrafts(航天器) have flown by,orbited(沿轨道运行) and even...
They'll help the scientists determine what exactly they'd like the rover to travel to or pick up. Beyond that, it's just super cool to have lasers on robots. Frequently Answered Questions How many Mars rovers have been sent to Mars? NASA has sent five rovers to Mars: Sojourner, Spirit...
They'll help the scientists determine what exactly they'd like the rover to travel to or pick up. Beyond that, it's just super cool to have lasers on robots. Frequently Answered Questions How many Mars rovers have been sent to Mars? NASA has sent five rovers to Mars: Sojourner, Spirit...
Over the years, scientists have made exciting developments and discovered numerous innovative applications for nanotechnology, as it stands nanotechnology has the potential to change life as we know it.多年来，科学家们取得了令人兴奋的进展，并发现了纳米技术的许多创新应用，就目前而言，纳米技术有可能改变...
18.-Could you tell us to travel from Earth to Mars by spacecraft?-It takes months.I think.( )A.how far it takesB.how often does it takeC.how long it takesD.how soon does it take
For generations, people have dreamed of travelling to Mars to explore Earth’s closest neighbour. NASA and other space agencies have announced plans to send people to the Red Planet. But such a manned mission is years away. In the United States, some volunteers are learning how people will ...