enter code

基本解釋

You then enter code within your DOCTYPE inside square brackets ([]), as in Listing 6.
然后在 DOCTYPE 的方括號(hào)（[]）內(nèi)部輸入代碼，如清單 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.
當(dāng)您在 Eclipse 中輸入代碼的時(shí)候，會(huì)經(jīng)?？吹竭@條綠線(xiàn)。雖然您可以忽略它，它似乎也沒(méi)有明顯的作用，但是它還是值得我們花幾分鐘來(lái)解釋一下的。
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.
當(dāng)您在 Eclipse 中輸入代碼時(shí)，您將看到這條綠色的線(xiàn)，雖然您只能忽略它，它沒(méi)有什么明顯效果，但現(xiàn)在花費(fèi)一分鐘時(shí)間來(lái)解釋它可能是值得的。

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.
你也可以敲回車(chē)鍵-,但是會(huì)讓你的代碼看起來(lái)亂七八糟,反斜杠n就是換行符。
哈佛公開(kāi)課 - 計(jì)算機(jī)科學(xué)課程節(jié)選

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