Polyether ketone ketone (pekk)

polyether

n. [化]聚醚,多醚

ketone ['ki:toʊn]

n. 酮;

ketone ['ki:toʊn]

n. 酮;

I always take good care of my body.

我总是很关注身体健康。

He should have a long spoon that sups with the devil.

跟坏人打交道，要特别小心。

We set off down the hill. At first it was easy walking over the grass. Then the grass turned to bushes and the hillside became steeper. We climbed over rocks, through trees and found it more and more difficult to get down the hill. By now we were beginnin

我们开始下山，起初很容易地走过草地，后来草地变成了灌木丛，山峰变得更陡了。我们爬过岩石，穿过树林，发现下山越来越难。这时我们感到疲惫，雨也下大了。我在一小块草地上停下来，转身看看跟在我后面的弟弟。就在这时我在两块岩石中间发现了一个洞。“我过去看看，”我喊?2282