As a preventative measure, we are told to let in fresh air by opening the windows and not to use the air conditioners.
作为一项预防措施，我们被告知要打开窗户让新鲜空气进来，而不要使用空调。
2
As Venus was closer to the Earth, its parallax angle would be larger, and Halley worked out that by using Venus it would be possible to measure the Suns distance to 1 part in 500.