You've been buried in books for almost three hours. Why not go out to come up for air?I know. But I have to finish the books before I start to work on my paper.come up for air:换换环境，休息一会儿 ……

kiss as they perform at a Super Bowl party last week. Neither come up for air, as they use each ……

. "Every time I tried to come up for air, he pushed me back down again."NBC would not say how much ……

have to come up with something more realistic and effective. Those who have come to the plan...After President Xi Jinping praised the clean and fresh air in Guizhou province at this year ……

thin air 无影无踪，虚无的状态The detective’s speculation doesn’t come from thin air.这位侦探的推测并非空穴来风。 ……

) will start to come from hole in top of can.  3. Wait 30 seconds, pick up can with tongs...气压的力量有多大？气压的力量有多大？This experiment shows you how powerful (有力量的) air pressure (气压) can ……

down our stomachs, while making air go up and get out of our mouths. However, in space, there is no gravity. When astronauts try to burp, food and drinks can come up, too. So, they have to burp ……

治理PM2.5，共同呼唤蓝天。WE always check the weather before a trip. But after hearing a lot about air pollution, often we also wonder: how will the air be tomorrow? On Sept 1, the National ……

government set up a research station (研究站) at Cape Grim to measure (测量) the air. They capture air from... started measuring CO2 here in 1976, it was already up to 330. Since then we have come to where we ……

士硬币) there.--------------------------------------------------Hot air balloons come in different shapes and sizes in Doha, Qatar.  VCGFloat up on colorful hot air balloonsFloat up on colorful hot air balloonsIn ……

A: I'm going on holiday with my family.B: Where are you going?A: I don't know. The decision is still up in the air.--------------"Up in the air": 一切尚未确定。 ……

by a wall of invisible air. The air shield will protect the statue from dust and the over 1 million tourists who come to Italy to see it every year, an Italian museum official has said."This wall of air ……

think about air pollution, big industrial factories or cars normally come to mind," says David... be in danger after new laws to control air pollutioncame into force(生效) last week. Restaurant owners ……

the middle of the storm.As more heat and air come together in the middle of the storm, a typhoon is “born”.As more heat and air come together in the middle of the storm, a typhoon is “born”.What to do after ……

, US, has a tradition of making and flying hot-air balloons to celebrate _____________.2. They spent _____________ days making hot-air balloons this year. 3. The balloons can fly high if the day ……