已知函数f(x)＝e^x－e^－x(x∈R且e为自然对数的底数)．

(1)判断函数f(x)的奇偶性与单调性；

(2)是否存在实数t，使不等式f(x－t)＋f(x²－t²)≥0对一切x都成立？若存在，求出t；若不存在，请说明理由．

解释下列词语

1．视野：______________________________

2．错综：______________________________

3．妙手偶得：______________________________

4．锤炼：______________________________

5．主宰：______________________________

6．垠：______________________________

7．坦荡如砥：______________________________

8．倦怠：______________________________

9．潜滋暗长：______________________________

10．恹恹：______________________________

11．力争上游：______________________________

12．旁逸斜出：______________________________

13．倔强：______________________________

14．参天：______________________________

15．不折不挠：______________________________

16．婆娑：______________________________

17．伟岸：______________________________