太陽(yáng)能
- 跟蹤導(dǎo)練（四）3
dome （太陽(yáng)能穹頂） would cover the whole city.Supporters of underground development say that building down rather than building up is a good way to use the earths space. The surface， they say， can be used for farms， parks， gardens， and
時(shí)代英語(yǔ)·高一 2016年4期2016-09-21