capital letters (= letters of the alphabet in the form and larger size that is used at the beginning of sentences and names), used especially in order to emphasize something or show that you are angry

Using all caps is considered yelling online. 在网络上，全部使用大写字母表示大喊的意思。

written in capital letters (= letters of the alphabet in the form and larger size that is used at the beginning of sentences and names), especially in order to emphasize something or show that you are angry about something

She keeps getting shouty, all-caps emails from her boss. 她不断从老板那里收到全部用大写字母写成的、咄咄逼人的电子邮件。