My classmates and I spent a semester editing example after example of rambling or confusing letters, memos, and other professional materials.

我和同学用了一学期的时间不断地修改那些杂乱无章的信件，备忘录和其他专业材料。

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Billions of letters, photographs, video and audio recordings, drawings, maps, treaties, posters, and other informative materials exist that tell the stories of America's history as a nation.

数十亿的信件、自传、录像和音频资料、图画、地图、条约、海报和其他情报资料讲述着美国作为一个国家的历史。

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Homes can have writing centers with materials such as magnetic letters, white boards, pencils, crayons, markers and paper.

可以在家中辟出一块地方用做孩子的写作中心，并配有小白板，英文字母教具，铅笔，彩笔和纸张等材料。

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You then review and sign the letters, enclose any supporting materials (such as copies of receipts), and mail the letters to the CEO and customer care executive.

CNN: Got a problem? Complain online!

Materials given to the Morgan also include letters the center wrote to Salinger and exchanges between the center and Salinger's widow, Colleen O'Neill.

WSJ: Correction: Salinger letters story

Intelligence analysts have spent the months since bin Laden was killed sifting through documents, letters, video and other materials retrieved from his compound in Abbottabad, Pakistan.

WSJ: Bin Laden Plotted to Kill President Obama, Documents Show