Mannosan
甘露聚糖
🗣️ 情景例句
Advice doesn't normally come cheap, but this piece is for free...
通常来说，忠告都是价值不菲的，但这个是免费赠送的。。。
Competition for this kind of goods is tough.
这种商品的竞争非常激烈。
You always say that,but we never win anything!
你老是那样说，但是我们从来没赢过！