This week Wal-Mart is set to announce a major initiative aimed a

This week Wal-Mart is set to announce a major initiative aimed at helping cotton farmers to go organic:it will buy transitional cotton at higher price,thus helping to expand the supply of a key sustainable material.
【正确答案】：本周沃尔玛将宣布一项旨在帮助棉农走向有机化的重大倡议。【解析】原句是主谓宾结构的简单句，谓语中is set to do sth.译为“准备做某事”。Aimed at…是过去分词短语作initiative的后置定语，汉译时将其置于中心词前。