refining

The raw material for the tyre is a byproduct of oil refining.

这种轮胎的原料是汽油提炼的副产品。

The refining process removes the bran and germ from the grain.

精制过程将麸皮和胚芽从谷物中除去。

Finally, the refining and burning of petroleum and its products can cause air pollution.

最后，石油及其产品的提炼和燃烧过程会造成空气污染。

Several processes—melting, refining, homogenising—take place simultaneously in the 2000 tonnes of molten glass in the furnace.

熔炉里的2000吨熔融玻璃中，几个过程——熔化、精炼、均质化——在同时进行。

Occasionally, a bubble is not removed during refining, a sand grain refuses to melt, a tremor in the tin puts ripples into the glass ribbon.

"有时候，在提炼的过程中会出现这些情况：一个气泡没有被移除，一个砂粒没有熔化，（熔融的）锡的一次颤动把波纹带进了玻璃带中。