Use a spell checker if you need to.

如果需要，可以使用拼写检查器。

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Powerful editing features include tables, spell checker, and quick hyperlinks.

强大的编辑功能包括表格，拼写检查，和快速超链接。

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You can invoke the spell checker directly by using spell: followed by your keyword.

你可以在关键词前加上”spell:”来直接调用Google的拼写检查功能。

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Another change was a spell checker that keeps an eye on every bit of text typed in almost any Firefox browser box be it in a web-based e-mail program or an add-on that lets people post blog updates directly.

BBC: NEWS | Technology | Firefox browser for web 2.0 age

Before you hit the "Send" button, use a spell-checker, and proofread to catch homonyms that are wrong.

FORBES: Magazine Article