Every great-grandmother could tell us that habits are established by repetition but now we know that repeated behaviours actually chemically strengthen the neuronal pathways, creating shortcuts for specific actions, for better or for worse.

• 我们的曾祖母都会告诉我们，习惯是通过一次次重复养成的，但是现在我们明白了重复实际上是在化学上增强了神经细胞线路，为一些特定的行为创造“快捷方式”，或者增强或者减弱。