You can also use import to introduce other non-constant members as well. For example, consider a math utility library (of questionable value perhaps, but still...) in Listing 6.
也可以使用import来引入其他非常量的成员。
2
Through constant research and study, the company has won four Utility Model Patent and produced twelve key products.
经过不断探索研究，公司荣获国家实用新型专利四项，重点新产品12项。
3
Other characteristics, such as frequency, wave shape, and phase balance are seldom recognized by the consumers but are given constant attention by the electric power utility engineers.