comfort zone
noun
1- a place or situation where one feels safe or at ease安全区, 舒适范围; 令人感到安全（或舒适）的地方（或情况）：
outside my comfort zone.
在我的安全区之外。
1.1
- a settled method of working that requires little effort and yields only barely acceptable results舒服的（或安逸的）工作方式：
if you stay within your comfort zone you will never improve.
如果你总是轻轻松松地干活, 你就永远不会进步。