发现恒星围绕银河系中心的超大质量黑洞运行是天体物理学的一个转折点。
The pursuit of happiness is not about feeling good all the time, but about striving toward meaningful goals.
Every tree we plant today is a legacy for generations we'll never meet.
为了生存,我们必须适应。为了繁荣,我们必须创新。
译文:很幸运生在太平年代,害怕到了年老时日不多。赏析:人生短暂,生命脆弱,我们要珍惜当下的生活,过好每一天,身在福中要知福。