慢速英语:Is There a Ninth Planet in Our Solar System?
日期:2016-01-25
Words in This Story
solar system –n. our sun and the planets that move around it
elongated –adj. stretched out
orbit –n. path of one body as it moves around another
simulation –n. something made to look or behave like something else so it can be studied
fine-tuning –v. to make small changes to improve the way something works