A good abstraction is one that emphasizes the important details and suppresses the unimportant ones.

I always try to make films that I would want to see.

If you aren't in over your head, how do you know how tall you are?

粮食安全是国家安全的基石。

这句话杨在不同场合说过多次，每次表述时可能有个别字的差异。

我不必是人类才能理解生命的价值。

历史由那些幸存者书写。