Much tougher is the chicken and egg problem; the tool has to be useful out of the gate, which is tough if the use derives primarily from the interaction of many people.
难得多的是鸡生蛋和蛋生鸡的问题。 工具要有用且没有门槛限制，如果主要用来进行人们之间的互动，则更需这样。
To add a Formal Gate on the interaction frame, click a message palette creation tool.
在互动框上添加一个Formal Gate，点击一个消息面板创建工具。
This article gives a brief description of a special tool for assembling and disassembling of seal rings in the wedge-shaped gate valve for oil (gas) well-head assembly.
本文简要地介绍了装拆采油(气)井口楔形闸密封圈的一种专用工具。
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