没有人规定你必须永远快乐。

Collaboration across borders is key to solving the challenges of global hunger.

大胆梦想，努力工作，保持专注。

【讲解】：有了过错而不改正，这才真叫过错呢。

The main task in life is to give birth to ourselves, to become what we potentially are.

夜晚是一座伟大的城市，但星星是它的灯光。