You should maintain contact with the buyer.

你应该与买方保持联系。

Maintain contact with the ball as much as possible.

尽可能保持与球的接触面。

Maintain contact with the new culture. Learn the language.

试着去和新环境接触并学习他们的语言。

Develop and maintain contact with business generators (MICE Planner; travel agents; etc.).

开发和维护与业务生成器(MICE规划师；旅行社；等等)。

Maintain contact with casualties inside who can be seen or heard but who cannot be moved immediately.

对于不能立即救离而能够看到或听到的伤员，请与他们保持联系。