文件规定，刚度，强度，并有效地砖的形状，以整套计划。

Paper provides stiffness, strength, and the efficient brick shape to the package.

youdao

文件规定，刚度，强度，并有效地砖的形状，以整套计划。

Paper provides stiffness, strength, and the efficient brick shape to the package.

youdao