因此，反恐斗争具有长期性、艰巨性和复杂性。 打击?

Therefore, the fight against terrorism is very tough, complex and will take a long time.

中国的国家同一进程具有长期性、艰巨性与不可逆转性，大势所趋而任重道远。

China's national reunification process with a long, arduous, and the irreversibility of the general trend of development and a long way to go.

在讲话即将结束时我想要说，对于今后的任务，我丝毫没有低估其艰巨性。

Let me close by saying I do not underestimate the enormity of the task that lies ahead.