Coal is China's main energy source and will remain the cornerstone of China's energy security for a long time to come.
煤炭是我国的主体能源，在相当长时期内仍将是我国能源安全的基石。
认证计划是负责任林业实践的底线，而不是上限。
Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:
你是你最美好的事物。
The more specific you are, the more universal you become.
没有人足够智慧去了解什么是真正的好或坏。