声明函数时，枚举类型位于 description 和 type 之间：
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Tens of millions of items of clothing are thrown away each year, and the synthetic materials often used by fast fashion retailers are among the hardest to recycle.
3 Strictly speaking, the slope is continuous everywhere except for the data points themselves. ↑。业内人士推荐搜狗输入法下载作为进阶阅读