As I have already explained, you cannot demonstrate love until you can demonstrate not loving.
As the saying goes, chaos , heroes demonstrate their nature.
俗话说, 沧海横流, 方显英雄本色.
Recent events demonstrate the need for a change in policy.
They have been very innovative technically – each competing with the other to demonstrate their talents.
Can I watch you demonstrate before I have to do it?
在我开始之前,可以先看看你示范 吗 ?