Sometimes it's ok to use uppercase. Capital letters can add a touch of class to the apperance of your page. However, they should be used very sparingly. There are three reasons why you should avoid them in most cases:

有时，运用大写字母确实能提升网页的美观程度，但其实网页应该尽量少使用大写字母，下面介绍三点原因：

1. It is hard for the human eye to recognize words in all caps. This is because the shape around each word is the same. All words in uppercase are rectangular in shape, where words in lowercase have ascenders and descenders on some letters that vary the shape. Notice the difference in the shapes of these two words:

1. 人们很难辨认全部为大写字母的词语，因为每个单词的外观都相同，大写字母拼写的单词形状都是矩形。然而，小写字母却不是这样，这些字母的拼写会有上升或下降区别，所以小写字母的单词外形会有区别。通过以下两个单词观察区别：
DRAGONFLY
dragonfly

See the difference? We recognize words largely based on their shape. When the shape of all words is the same, it makes it much more difficult to read them.

看到区别了吗？我们主要根据外形认识词语，所以当外形相同时，我们很难区分词语。

2. Because of the shape of the letters, uppercase has a tendency to look harsh. Capital letters have a subtly threatening appearance. When your readers are confronted with a phrase (or even a single word) in all caps, it is likely to negatively influence them. Considering that you want visitors to read your copy, this is definitely not the feeling you want them to have.

2. 大写字母的单词汇让用户感到困惑，因为这些单词很难辨认。当用户对大写字母拼写的单词或短语感到迷茫时，他们会产生消极情绪。如果你希望用户浏览网站内容，那就不要让他们产生这种情绪。

Although this issue is important on a website, it's even more critical in emails. Since emails are more personal, uppercase can feel even more threatening. Always try to avoid using all caps in emails.

网站需要重点关注这个问题，电子邮件更要注意。电子邮件大多是针对个人的，这样更会让浏览者厌烦。因此，尽量避免在电子邮件中使用大写字母。

3. Uppercase is a form of emphasis, but it is very weak. When you use capital letters to emphasize a particular point, it will look a little different from the rest of the copy, but there won't be enough contrast for it to really stand out. It is far better to use a contrast in size, color or weight (for example, bold the text). These forms of emphasis are all easier to read, and they stand out much better.

3. 大写字母可以产生强调作用，但作用很小。利用大写字母突出某些重点内容时，确实使这些内容有点与众不同，但对比并不够明显，也就不能达到预想的目标。其实运用尺寸、颜色或者字体更好（比如：粗体字），这样突出效果更明显，内容更容易阅读。

As I mentioned earlier, there are times when it's appropriate to use uppercase. Just think carefully and use it sparingly.

在恰当情况下，确实需要运用大写字母，但一定不要滥用。

Just a quick note: You might have noticed that I use uppercase for the titles of the various sections of this newsletter. The reason is that it's the only form of emphasis I have, since this is a plain text newsletter. If I had the option of bolding my headings, I would definitely do that instead.

你可能注意到，在时事通讯的各个标题中，我运用了大写字母。是的，这是一种强调方法，因为这是普通的文本。如果存在突出标题的其它方法，我肯定不会这样做。

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