英语语法分析

It is necessary to develop and modificate traveller design and manufacturing technique.

因此，研发、改进钢丝圈设计和加工制造技术仍很必要。

Conclusion As clinic and epidemiology data, some index level were not established appropriate, it ought to perfect and modificate farther.

结论从临床和流行病学资料看，有些指标标准制定得不适宜，需要进一步完善和修改。

The liquid chemistry method is applied to modificate the surface of plastic packing and the properties of the modificated packing are tested.

采用液相化学法对塑料塔填料进行表面改性，并对改性后的填料作性能测试。