positive的同义词有optimistic，confident，hopeful；positive的反义词是negative。positive指积极的、良好的或有所助益的。例句：We must take positive steps to deal with the problem.

positive例句

This contract is advantageous to the owners.

这份合同对业主有利。

You'd better be more cautious, as your rival is in an advantageous position.

你的对手现在处于有利地位，所以你最好更谨慎一些。

Overseas investment has had a positive effect on exports.

海外投资对出口有积极影响。

The agreement should have very positive results in the long term

从长远来看，这个协议将会产生非常积极的影响。

His family have been a very positive influence on him.

他的家庭对他有十分良好的影响。

She tried to be more positive about her new job.

她力求对新工作更有信心。