"Sometimes you have to be apart from people you love, but that doesn't make you love them any less. Sometimes you love them more."
数学思想的真正考验是它能否激发更多的问题。
跨行业、跨边境的合作对于解决气候变化这一复杂挑战至关重要。
The best time to plant a tree was twenty years ago. The second best time is now.