The success of liberal democracy depends on the ability of its institutions to adapt to changing circumstances.
I don't sing because I'm happy; I'm happy because I sing.
质量比数量更重要。一个全垒打比两个二垒安打好得多。
跨行业的合作对于解决未来的能源挑战至关重要。
太阳每天都是新的。
石油和天然气的未来在于平衡传统专业知识和尖端技术。