Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.
煤炭的未來在于清潔高效利用。
在我看來,最完美的教育是這樣的理解練習,它最適合于加強身體和形成心靈。
對我們星球的最大威脅是相信別人會拯救它。