The unpredictability of global demand and the lag-time it takes to add more cows to a herd to meet demand can result in events like the recent cheese surplus.

全球需求的不可预测性，以及为了满足需求而扩大牛群规模所花费的滞后时间，可能会导致最近的奶酪过剩等问题。

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The unpredictability of global demand and the lag time it takes to add more cows to a herd to meet demand can result in events like the recent cheese surplus.

全球需求的不可预测性，以及为了满足需求而增加更多奶牛所需的滞后时间，可能会导致像近期奶酪过剩等事件的发生。

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The only way is to boost domestic demand to cut trade surplus.

惟一的办法是增加国内需求，从而减少贸易顺差。

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But Tilford says surplus countries like Germany have to provide more demand for southern European products.

VOA: standard.2010.02.26

We also do see aluminum supply and demand surplus continue to shrink.

FORBES: Investor Outlook on Alcoa: Bearish

And while domestic demand in surplus economies flags, the imbalances that have contributed to the current crisis will not right themselves, and will encourage protectionism.

ECONOMIST: Why China and Germany need to do more to boost demand

"Much more needs to be done to promote effective global rebalancing, which requires stronger demand in surplus countries and continued progress toward greater exchange rate flexibility, " Mr Lew said.

CNN: Leading economies promise to boost growth