9/9 · And many people say they don't need to know trigonometric functions, when they only want to go grocery shopping

9/9 · rappel 
Definition:  (verb) Lower oneself with a rope coiled around the body from a mountainside.  
Synonyms:  abseil, rope down...

9/9 · Only the mediocre are always at their best.

9/9 · now rank 6th, with 4997.2 PBS

9/9 · September 9
The soul becomes dyed with the color of its thoughts.

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9/8 · 今天才开始

9/8 · I think it's partly because many students today including me are lack of knowledge of life, which makes them seem not smart, so so...