下面是典型商业书信的一个例子。

Below is an example of a typical business letter.

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就下面的商业书信写封回信。

Write a reply to this business letter.

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实际上，商业书信有其特殊的写作原则。

In fact, the business correspondence has whose peculiar writing principle.

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一封好的商业书信应该是明确的、直截了当的。

A good business letter should be definite and direct.

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一封好的商业书信应该是明确的、直截了当的。

Then A is positive semidefinite, negative definite and negative semidefinite.

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一封好的商业书信应该是明确的、直截了当的。

Then A is positive semidefinite, negative definite and negative semidefinite.

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