前半句总结上文，下半句提出新观点。
That may sound like a minor change, but the implications are dramatic.
The nutrition concept sounds like a persuading point, but the hazards are also obvious.
转折表递进：讲某事对别的事情的影响。
These are not just inconveniences , but also an enormous drag on society.
These are not just daily necessities, but also a promotion of people’s appearance .
