leave sb. alone简单

There will be no charge and you will never be asked to justify or explain yourself; you will simply be welcomed in, offered help if you need it, and left alone if you do not.

不收任何费用，也永远不会要求你为自己说明或解释什么；你只会被欢迎进门，需要时得到帮助，不需要时则无人打扰。