Sometimes we stare so long at a door that is closing that we see too late the one that is open.

Sometimes we stare so long at a door that is closing that we see too late the one that is open.

有时候我们盯着一扇关着的门太久，以至于我们太晚才看到那扇开着的门。

-- Alexander Graham Bell 亚历山大·格雷厄姆·贝尔