The tight orbits meant the planets must have been engulfed when their host star swelled up into a red giant .
近距离旋转轨道也意味着当它们的恒星膨胀成一颗红巨星，其行星已经被恒星所吞没。
Since a new spanish railroad opened in 1992 , madrid 's business population has swelled at the expense of seville .
而自从新的西班牙铁路在1992年开通以后，马德里的商业人口膨胀，却牺牲了塞维利亚作为代价。
Like a rapidly expanding balloon , it swelled from a size smaller than an electron to nearly its current size within a tiny fraction of a second .
像一个迅速膨胀的气球，宇宙在远小于1秒的时间内，从小于电子的尺寸膨胀到了现在的规模。
The ranks of the world 's rich swelled to 8m during 2007 as the wealthy proved immune to the strains across global economies in the latter half of the year .
