第一次单季度销量下滑。

First Quarterly Drop in iPod sales.

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结果表明，模拟的作物气候产量潜力以玉米、单季稻为最高。

The simulated results showed that crops with highestclimatic yield potential were corn and single rice.

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（我们）有理由持有这样的疑虑：单季度如此骄人的经济表现是否还会在未来不断出现。

There are reasons to doubt that the impressive performance in a single quarter will be repeated in the coming months.

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