Sum of Angles of Triangle on Girl's Chest; 妹子，在你胸前随便画个三角形…
妹子，在你胸前随便画个三角形，内角和绝对是180°啊......
—from [2013-07-14 xie107 ] ( https://twitter.com/xie107 )
如果画的位子正确，可达到双曲几何及球面几何的境界，就不再是180度了。这还要看妹子的造化。
English Translation
girl, if you draw any triangle on your chest, the sum of angles is bound to be 180°…
if drawn on the right spot, it'll be in the realm of hyperbolic geometry and spherical geometry, and no longer 180 degrees. Her mileage may vary.