本期为第二讲，讲授磁盘操作系统——DOS。

This lesson will teach the disk operating system-DOS.

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对英语作为第二语言的人讲，这是一个尤其好的译本。

This is an especially good translation for people who speak English as a second language.

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接下来我们讲第二点，市场时机选择。

Let's move to the second point: market timing.

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下面我们讲关于“如何拼图以获得成就”的第二点：计划。

And that calls for the second thing about puzzle and goal achievement: a plan.

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从技术上讲，网络交换机工作在OSI模型的第二层（数据链路层）。

Technically, network switches operate at layer two (Data Link Layer) of the OSI model.

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下面我们讲牛顿第二定律。

Now we come to the Second Law, Newton's Second Law.

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第二个由小羊讲。

The second talk by the lamb.

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现在讲第二点，卡特尔船长。

Now, the second point, Captain Cuttle.

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这是你第二次给我们讲这个故事了。

This is your second time that you tell us the story.

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这是你第二次给我们讲这个故事了。

This is your second time that you told us the story.

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第二节讲它的一般理论。

The second part we introduce the theory.

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大多数人把英语作为第二语言讲。

Most people speak English as a second language.

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大多数人把英语作为第二语言讲。

Most people speak English as a second language.

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