A push factor can be as simple and mild a matter as difficulty in finding a suitable job， or as traumatic as war， or severe famine.转载《有道词典》，如有侵权请通知删除。
Part I1 the [ðə, ði:] art.这，那 ad.[用于比较级；最高级前]2 be [bi:] aux. v.(am,is,are之原型) vi.是;在3 of [əv] prep.…的；由…制成的；关于；由于4 and [ ænd] conj.
> Chinese astronomy enthusiast's 'chasing project'90后追星“青年”为中国空间站拍“写真”[Photo/Xinhua]Liu Boyang, a post-1990 astrophysics doctor and astronom
