Contact with other people is a basic human need.

和他人接触是人的基本需要。

《牛津词典》

We will contact you again if the need arises.

如果有必要，我们会再次和你联系。

《牛津词典》

Here's my card if you need to contact me again.

如果你需要再和我联系，这是我的名片。

《牛津词典》

You want decisions to be made there so you need some additional mechanism for decision making at the point of contact between the axon of one cell and the dendrite of another.

而想要做出决定,在一个细胞的轴突和下一个细胞的树突,的连接点上 需要额外的决策机制

耶鲁公开课 - 生物医学工程探索课程节选

Whether you are asking for a job introduction or a dentist recommendation, the effectiveness of your request to any specific friend comes down to willingness (will this person get back to me?) and ability (will this person know the contact I need?).

FORBES: How To Get What You Want From Anyone By Addressing These Two Issues

Chris Huhne, then the Lib Dem home affairs spokesman, said any legislation requiring communications providers to keep records of contact would need "strong safeguards on access", and "a careful balance" would have to be struck "between investigative powers and the right to privacy".

BBC: Email and web use 'to be monitored' under new laws

That one critical moment you need that one contact, or you need to access that document on Google Docs, you may not have it.

FORBES: Frustrated With Facebook