The methods could effectively improve the quality of field practice teaching of cadastration after a few years practice.

经过几年的教学实践证明,这些方法可以有效地提高地籍测量野外教学实习的质量。

We should consider that multiple addition or increase concentration of Krilium in field practice may strength the effectiveness of soil amelioration.

同时，野外进行改良应该考虑多次少量施用或增加改良剂浓度的方法来增强改良效果。