enter code

基本解释

You then enter code within your DOCTYPE inside square brackets ([]), as in Listing 6.
然后在 DOCTYPE 的方括号（[]）内部输入代码，如清单 6 所示。
You'll see this green line often as you enter code in Eclipse, and while you can simply ignore it with no apparent effect, it's worth explaining now.
当您在 Eclipse 中输入代码的时候，会经常看到这条绿线。虽然您可以忽略它，它似乎也没有明显的作用，但是它还是值得我们花几分钟来解释一下的。
You'll see this green line often as you enter code in Eclipse, and while you can simply ignore it with no apparent effect, it's probably worth explaining it now.
当您在 Eclipse 中输入代码时，您将看到这条绿色的线，虽然您只能忽略它，它没有什么明显效果，但现在花费一分钟时间来解释它可能是值得的。

You can certainly hit Enter but as we saw-- seen that very quickly makes a mess of your code and such and so backslash N is new line.
你也可以敲回车键-,但是会让你的代码看起来乱七八糟,反斜杠n就是换行符。
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