It is an efficient obstacle to material exchange and avoids the skin's drying out.
它是物质交换的有效阻隔并防止皮肤干燥。
The main obstacle in biodiesel application is from the production cost, especially in the raw material supply and complex production processes.
目前制约生物柴油商业化大批量生产的瓶颈问题是其生产成本高，包括原料成本高，制备工艺路线复杂。
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