而异戊二烯必须极其纯净才能生产出合成橡胶。
Isoprene needs to be extremely pure to make synthetic rubber.
采用极其纯净的酯类油或馏程极窄的合成烃为基础油，赋予成品油等高的闪点，使用更安全。
The extremely pure ester oil or extremely narrow distillation range of base oil, synthetic hydrocarbon oil to the same height as flash point, using more safe.
尽管与今天相比只能用到有限的颜色组合，但海伦娜服饰上的色彩仍旧极其纯净清澈，甚至在阴影里的细节，也不失委罗内塞所特有的张力和丰富层次。
Although the canvas from today has a limited palette, the colors of Helena's clothing are extremely pure and clear and, under the shadow, they don't lose his strength or intensity.
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