The answer is simple: whenever you need to do something that takes a long time.
答案很简单：需要完成耗时的任务的任何时候。
You need to build a relationship with investors over a long period of time.
你需要用一段较长期的时间来和投资人建立关系。
So you need to build your body to go at top speed for a long time .
因此，你需要磨练自己的身体，维持长时间的快速移动。
As long as you want, when you lost time, a time when most in need of a shoulder and told me, I will immediately appear.
只要你愿意，当你失落的时候，最需要一个肩膀的时候，告诉我，我会立刻出现。
If you work full time you may need a long day care service.
如果你全职工作您可能需要长时间日间护理服务。
You need a very long period of time to adapt, this is a challenge.
您需要一个很长的一段时间来适应，这是一个挑战。
This is a time when you need to take the long view.
这是你需要长远考虑的时间。
The large jar lasts a long time since you only need to use a little.
一大瓶能用很久，因为每次只用一点点。
The large jar lasts a long time since you only need to use a little.
一大瓶能用很久，因为每次只用一点点。
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