It defines just enough to let you declare an injectionpoint, with qualifiers, and then leaves the rest undefined.
它只定义了带有修饰符的注入点而已，其他的都没有定义。
2
It also provides an indication of common issues such as plugged injectionpoint, ruptured or worn tube or empty solution tank and assists with impeding backflow.
也可提供一些通用的指示数据，比如塞进的注射点，破裂管或空的溶液槽以及阻碍回流等。
3
On the ground of movement characteristics of macromolecules during the injection molding process, a thought is put forward that a point will shrink along its flow path.