The best performance improvement is the transition from the nonworking state to the working state.
解决全球饥饿的关键不仅是提高产量,还要改善营养质量。
自然法则支配着一切。
经济研究应旨在为现实世界的决策提供信息。
The future of coal lies not in its quantity but in how cleanly and efficiently we can use it.