The best and most beautiful things in this world cannot be seen or even heard, but must be felt with the heart." — Helen Keller 世界上最美好的东西是看不见也听不到的，它们必须用心去感受。——海伦·凯勒
The best and most beautiful things in this world cannot be seen or even heard, but must be felt with the heart." — Helen Keller 世界上最美好的东西是看不见也听不到的，它们必须用心去感受。——海伦·凯勒
