The equation of air demand was derived from the theory of oxygen transfer in aeration.
根据曝气过程中氧转移的有关理论，推导出需气量的表达式；
I will explain for you. The other two are mail transfer and demand draft.
我来跟您解释，其余两种是信汇和票汇。
Today, however, we should transfer to the policy which stresses both domestic and external demand.
但从今天来看，应转入“内需”、“外需”并重的政策。
Today, however, we should transfer to the policy which stresses both domestic and external demand.
但从今天来看，应转入“内需”、“外需”并重的政策。
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