Interface methods have public accessibility, which cannot be changed by the implementing type.

接口方法具有公共可访问性，不能通过该实现类型来更改。

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While those bonds are expressly non-transferable, which means they cannot be sold to the general public, the federal government can sell new bonds to the public to pay off these Social Security bonds, without exceeding the current national debt limit.

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No country has relied too much on cuts in public investment, which often cannot be sustained.

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Many private establishments (which must be affiliated to a public university and cannot be run for profit) suffer the same deficiencies.

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