音标：[ә'θilidi:n] ；

diethyl ether[化]乙缩醛

An unsymmetrical, divalent, hydrocarbon radical, C2H4
metameric with ethylene but written thus, CH3.CH to distinguish it from
the symmetrical ethylene, CH2.CH2. Its compounds are derived from
aldehyde. Formerly called also ethidene.

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back-pressure testing

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blue cypress l.

botsio

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by evidence of good character