I did come across a document (PDF) from the U. s. Consumer Product Safety Commission that suggests that ages four and five are when it's appropriate for kids to "ride small bicycles."

我怡好从美国消费品安全委员会里看到一份文件(PDF格式的)，上面告诉我们，四岁五岁是孩子“骑儿童自行车”的适当年龄。

youdao

According to this handy little booklet (PDF) from the U. S. Department of energy, 11 percent of a household's energy budget is spent on lighting.

根据这本美国能源部的方便小册子(PDF)，家庭能源预算的11%花在了照明上。

youdao

Several of 2002's most popular Server clinic columns explained how to manage common desktop technologies, including PDF and DOC files, from servers.

年度最受欢迎的 服务器诊所专栏中有几篇文章解释了如何从服务器管理常见的桌面技术，包括 PDF 和 DOC 文件。

youdao

Federal form 1040-SS, U.S. Self-Employment Tax Return (downloads as a pdf).

FORBES: A Beginner's Guide To Taxes: Which Tax Form Should I File?

Today, I am proud to release the U.S. Government six-year strategy to combat malaria (pdf) globally.

WHITEHOUSE: Our Top Stories

In Safari, for example, you can Tweet a link to a Web page, send it via Messages or e-mail it as a link, a PDF attachment or inside the message's body.

CNN: Review: Mac's Lion adventure continues