The piers that anchor the house to the ground and the concrete pads on which the chassis sits are constructed on-site, using local labor and conventional construction techniques.
One of the big difficulties was labor shortage in the construction field like concrete form work craftsmen.
其中最大的一个困难是工地上缺少劳工比如浇筑混凝土之类的熟手。
3
The author holds that scientific labor bears the character of twoness, and people must pay attention to study the concrete form and special rule of scientific labor of modern times.