The foreboding has two general sources and four specific causes.

这种对未来不详得预感有两个普遍的来源和四项具体的原因。

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We need to define four wrappers to access four different types of data sources.

我们需要定义4个包装器来访问4种不同类型的数据源。

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I put forward four profit sources considering main profit source of enterprises.

主要从利润来源方面对企业进行全面考虑，提出四个利润来源。

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I put forward four profit sources considering main profit source of enterprises.

主要从利润来源方面对企业进行全面考虑，提出四个利润来源。

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