refiners
精炼者
精炼机（refine 的复数）
例句
Some refiners are following suit.
一些炼油商也尾随其后。
Big refiners say the measure guarantees them a market for as much biodiesel as they can produce.
主要的炼油商们称此项措施为他们所能生产的生化柴油保证了市场。
Who would think that the growers of castor beans and the refiners of castor oil are a part of it?
又有谁知道蓖麻子和精炼的蓖麻油就是其中的一部分呢？
