This can save a lot of time for someone who has a large Contacts list, or it can be helpful if you need to chat with someone you really don't need to add to your Contacts list.
对于具有庞大 Contact 列表的用户这可以节省大量时间，或者如果您需要与确实没有必要添加到 Contact 列表中的某个人聊天，该特性也十分有用。
Can start the flow of contacts and dynamic friction resistance is to minimize the friction resistance, it can save energy, easy to get a higher velocity.
由于流动接触可使起动磨擦阻力及动磨擦阻力为极小，因此可以节省能源，容易得到较高运动速度。
Studs are commonly used to fulfill specific design functions, to save money in production costs, to function as electrical contacts or to replace self-tapping or removable screws.
螺柱通常应用于满足特殊设计功能，节省生产成本，充当电触头或者替换自攻螺丝、可拆卸螺丝。
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