It is neither realistic nor fair to set the scale of contribution simply by the size of foreign exchange reserves.

仅仅根据外汇储备规模来决定出资额度是不现实的，也是不公平的。

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Determine the size of the foreign exchange reserves for the theoretical study and practical terms is not only the focus but also difficulty.

确定外汇储备的规模对于理论研究和实际操作而言既是重点又是难点。

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Till now many scholars have done some valuable researches in the field of the proper size, sources and its currency structure of the foreign exchange reserves.

中国外汇储备问题向来备受各方关注，已有不少学者对外汇储备的适度规模、来源以及币种结构等方面问题做了较有价值的研究。

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