分析的整个发展和运算过程现在都可以通过机械来执行。
在没有生命力的帮助下合成尿素是我们这个世纪最重要的发现之一。
You are never too old to set another goal or to dream a new dream.
Climate change and overfishing are twin threats we must tackle together.
Think wrongly, if you please, but in all cases, think for yourself.
自然界中没有线条，只有相互映衬的色彩区域。