心理学理论的价值是由其实用性衡量的。

Sustainability isn't an option; it's our responsibility to the next generation.

The poet is not separate from the world; the poet is of the world.

问题的解决是突然出现的，而不是通过逐步、一步一步的过程来接近的。

In science, the most dangerous phrase is 'We've always done it this way.'

I never know what I think about something until I read what I've written on it.