The school building formed a hollow square, with a playground in the middle.

校舍呈中空四边形，中央为运动场。

The school buildIngs formed a hollow square, with a playground In the middle.

校舍呈中空四方形，中央为运动场。

The article introduces the main characteristics and application prospect of prestresses reinforced concrete hollow square pile.

预制空心方桩兼备预制桩和预应力管桩的一些特性。

As the name suggests, this is four two- or three-rank lines of infantry arranged as a hollow square, with everyone facing outwards.

如它的名字一样，方阵由四组排成两线或三线的步兵组成一个空心正方形，所有人都朝向外侧。

Prefabricate hollow square pile is a kind of new pile, of which performance is between the solid square pile and prestressed pipe pile.

预制空心方桩兼备预制桩和预应力管桩的一些特性。