ref: http://a-chien.blogspot.com/search/label/%E5%BE%AA%E7%92%B0
https://giphy.com/gifs/heart-l3vRhFgWX0uEOEyWc
心臟_ 慢版
via GIPHY
心臟_ 快版
https://upload.wikimedia.org/wikipedia/commons/thumb/5/56/Cardiac-Cycle-Animated.gif/400px-Cardiac-Cycle-Animated.gif
心臟著色_線稿
