He is collecting materials for a book.

他正在为写书搜集素材。

youdao

Bill busied himself with collecting materials.

比尔忙于收集材料。

youdao

She's collecting materials for her latest novel.

她在为其最新的小说收集素材。

youdao

"Obama as a presidential candidate was big news in Africa,and I decided that since we have a commitment in this library to collecting all kinds of information materials produced in Africa, we should immediately begin to collect materials about Obama, about how Africans responded to the Obama candidacy."

VOA: standard.2010.07.10

The Center for Computational Materials Science and Engineering Data is an effort by ASM International to define protocols collecting, disseminating, and managing materials data.

WHITEHOUSE: External Stakeholder Activities

On Saturdays the haulers, their wives and their children gathered at the recycling center to clean out the plastic pails they gave to customers for collecting the newspapers, magazines, bottles and other recycling materials.

CNN: Garbage hauler unloads on life in the wastestream