这些日子，他正在收集一本关于足球比赛的书的材料。
These days, he was collecting materials for a book on football match.
我们收集这些推荐证言，并将其展示在所有销售材料上和网上。
We collected those testimonials and display them on all sales materials and online.
为了这些，他实验了不同种类的高分子聚合物并且试图寻找更好的办法结合材料和收集电量。
To this end, he is experimenting with different kinds of polymers and seeking better methods of combining the materials and collecting the electric charge.
应用推荐