粮食问题不仅是经济问题，更是政治问题，关系到国家的长治久安。

The truth can be a double-edged sword, cutting both ways.

你给予的越多，收获的就越多。

The key to successful investing is to have a clear strategy.

To achieve satisfactory investment results is easier than most people realize; to achieve superior results is harder than it looks.

统计学领域不仅是分析数据的工具，也是一种思考世界的方式。