Translation of "constructive" into Chinese

Your opinion is very constructive.

你的想法很有建设性。

I need to go to the China Construction Bank.

我需要去一趟中国建设银行。

Effective and constructive negotiations are essential to a permanent and comprehensive settlement in Darfur.

有效和建设性的谈判是实现达尔富尔的永久和全面解决的关键。