1、opportunity
1.Catch at every opportunity.
抓住一切机会
2.Opportunity knocks but once.
良机难再
3.Opportunity makes the thief.
盗贼总有可乘之机
2、demonstrate
vi.
1.示范,展示
vt.
1.说明,演示
Recent events demonstrate the need of change in policy.
最近的事态表明政策需要改变。
This demonstrates that all power belongs to the people.
这说明一切权力属于人民。