1. This box is made of cardboard.
    这个盒子是硬纸板制的。

2. The string is wound round a cardboard cylinder.
    线缠绕在纸筒上.

3. Mrs. Ramsay was instructed to place the money in a cardboard box and to leave it outside her door.
    他让拉姆齐太太把钱放在一个纸盒里，然后将纸盒放在门口。