The main elements of the digital library system structure are digital target, handle and storage.
数字图书馆体系结构的主要构件是数字对象、句柄和仓储。
The difficulty of energy storage is one of the main problems bothering the power system.
电能难以储存的性质一直是困扰电力系统的主要问题之一。
The difficulty of energy storage is one of the main problems bothering the power system.
电能难以储存的性质一直是困扰电力系统的主要问题之一。
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