由于这种泵的结构和螺杆间存在的侧间隙，它可以输送非润滑性介质。

Owing to the pump structure and side clearance between screw, it can transport non-lubricative medium.

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目前，我国的外贸结构存在着非持续性的弊端。

At present, the foreign trade structure of our country is unsustainable.

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由于其非合法性存在而被视为城市里的边缘经济形式。

Due to the existence of legitimacy being treated city border economy form.

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由于其非合法性存在而被视为城市里的边缘经济形式。

Due to the existence of legitimacy being treated city border economy form.

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