positive 
英 [ˈpɒzɪtɪv]  美 [ˈpɑzətɪv] 
n. 正数；正面；阳极；实在的事物

adj. 确定的；积极的；完全的；原级的；正的；阳性的

例句：
Etta was now taking a more positive attitude. 

埃塔现在的态度更为积极。

Be positive about your future. 

对未来要乐观。

Her husband became much more positive and was soon back in full-time employment. 

她丈夫比以前乐观多了，不久便重新开始了全职工作。

Moving away from his sister had a positive effect on John. 

和姐姐分开对约翰来说有好处。