大自然的铁律是：有得必有失 如果你想让蚂蚁来，你就在地上放糖。

The universe is not hostile, nor yet is it friendly. It is simply indifferent.

Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.

请转告我对这家饭店厨师的赞誉，这是全世界最糟糕的三明治了，还有，我点的是豆瓣菜三明治，我并不是要面包片中夹一块菜田。