A well-designed system should be easy to use, easy to understand, and easy to modify.
眼睛同时看两样东西,就会看不明白;耳朵同时听两种声音,就会听不清楚。
永远不要回头看,除非你想走回去。
The human heart is the most deceitful of all things, and desperately wicked. Who really knows how bad it is?