该机制的主旨就是限制牛奶产量。
在供应方面，牛场数量的减少导致牛奶产量增长相对缓慢。
On the supply side, relatively weak growth in milk production from reduced cattle herds, particularly in some exporting regions, has under-pinned firm prices.
牛奶产量增加了两倍，达到1.03亿公吨，同时期全球牛奶产量增加了一半。
Its milk production trebled, to 103m tonnes, over a period when global milk output increased by half.
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