Pek
[化] 聚醚酮
🗣️ 情景例句
We can write letters. It's cheaper than calling.
我们可以写信就好，那比打电话便宜。
It's not too heavy,but I don't know the exact weight.
它不是太重的，但是我不知道准确的重量。
Are you OK?
你没事吧？