1·Because it has unique structure and performance, its application prospect in industry is very broad and quite optimistical.
由于它具有独特的结构和性能，在工业中有着广泛的应用前景，且前景相当乐观。
2·What is it behind conjuncture? For optimistical people, it is a favourable turn.
我想我是一个乐观的人，而且相信转机之后一定会有勃勃生机。
3·I am the MOST optimistical man in the WORLD!
我是世界上最乐观的人！
4·The prosocial behavior is an important sign for the individual socialization. However, the status quo of the prosocial behavior for the undergraduate is not optimistical.
亲社会行为是个体社会化的重要标志之一，然而，大学生的亲社会行为的现状不容乐观。
5·It is not optimistical to the state of mental health among the college students. This kind of mental problem is complexly caused by many reasons.
目前，大学生心理健康状况不容乐观，大学生的心理问题是多方面原因综合造成的。