We could do it dy dx. Or, maybe we will want to actually make a change of variables to first shift this to the origin, x-2 you know, change x to x minus two and then switch to polar coordinates.

也可以dy，dx来划分，或者,对变量做一下变化，移动到原点，就是把x变成,然后再转化成极坐标。

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As to the origin and the mechanics of total gas curve "negative shift" from TDC comprehensive logging unit, we have an initial recognition of it by theoretical and wellsite test.

对于TDC—综合录井仪的气测全量曲线“负漂”成因机理，通过理论分析和现场试验，有了初步认识。

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Through the introduction of the origin, essence and classification of the theory of translation shift, it aims at emphasizing the necessity of translation shifts in the process of translation.

本文旨在通过分析研究卡特福德的翻译转换理论，详细介绍优秀英文译作在创作过程中所需进行的各种转换。

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