例句與造句

1. A group focused on a IEEE standard 1902.1 wrote a comprehensive summary and plan English explanation-heavily supported by cross-references and back up material and reviewed by many users.
2. "Our law firm backs up material constantly, but who knows if every business in the trade center did the same ? " asked the 30-year-old associate, who did not want his name used.
3. It's difficult to find back up material in a sentence. 用back up material造句挺難的