direct determination of oxygen
direct determination of oxygen
氧的直接测定
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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However only indirect approaches can be applied to the determination of oxygen demanded by tiny living individuals because in this case it is hard to make direct measurement.
然而对于一些微小生物个体无法直接测量，只有通过间接的方法求得。
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