The poem is a way of holding on to what otherwise would be lost.
The discovery of DNA structure was like unraveling a very complex puzzle.
Laughter and tears are both responses to frustration and exhaustion. I myself prefer to laugh, since there is less cleaning up to do afterward.
该称颂的却不称颂,这就是不仁。 
Responsible forestry is not a choice, it's an obligation for all of us.《Forests of Tomorrow》