But transactions are also expensive; they consume valuable resources and can slow down an application.
但是事务的开销也很大；它们会消耗宝贵的资源并且会减慢应用程序的速度。
Social networks, if you know how to use them, are valuable resources.
当你学会利用社交网络的时候，它们会是非常宝贵的资源。
All these are the valuable resources for the environmental education.
这些对于中国环境教育来说都是难能可贵的资源。
All these are the valuable resources for the environmental education.
这些对于中国环境教育来说都是难能可贵的资源。
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