Explaining what makes a product or service useful is simple: it is something that people are using repeatedly and on a regular basis.
要解释什么样的产品或服务实用其实很简单：人们会反复不断地经常使用它。
Good Design makes a product useful.
好的设计是让产品有用处。
What makes a product owner useful to his company and team is attending every one of these user tests.
使得产品主管对于公司和团队有用的就是参与所有用户测试。
This makes it useful in technical discussions between the product designers and mould designers prior to the manufacture of the mould.
这关于在消费模具前，产物设计师和模具设计师停止手艺上的会商是很有协助的。
This makes it useful in technical discussions between the product designers and mould designers prior to the manufacture of the mould.
这关于在消费模具前，产物设计师和模具设计师停止手艺上的会商是很有协助的。
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