需求量比较小，并且您不能预测未来的需求(例如，特定于语言数据的用户语言的改变)。
The chance that you'll need it is small and you cannot foresee needing it in the future (for example, change of user language for language-specific data), and.
蛋白质需求比较复杂，因为我们的需求量随着年龄而改变。
Protein requirements are complicated because the amount we need changes with age.
房屋需求量，用改变新的买主注册房地产代理商，为第二个月，降低2.2%。
Demand for homes, measured by the change in new buyers registering with real-estate agents, fell for a second month, dropping by 2.2 percent.
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