在数学中，提出问题的艺术必须比解决问题更有价值。
In mathematics, the art of proposing a question must be held of higher value than solving it.
The bitterest creature under heaven is the wife who discovers that her husband's bravery is only bravado.
弦理论的景观是广阔而复杂的，可能有10^500个不同的可能宇宙。
伟大的领导者倾听多于发言。