The exterior walls were made of preformed concrete.

外墙是用预制混凝土建造的。

Preformed hole allows for convenient tagging.

预制的孔使得标记简单方便。

Preformed hole allows for convenient tagging .

预制的孔使得标记简单方便。

A new kind of casting preformed block is introduced.

介绍一种新型浇注料预制块。

Great works are preformed not by strength but by perseverance.

伟大工作的完成，不是凭力量，而是凭毅力。