| 单词 | allochthonous | 
| 释义 | allochthonousadjective  al·loch·tho·nous   variants  or less commonly allocthonous  -thənəs 1  a    : of or relating to the rocks of an allochthon    b   of coal   : formed elsewhere than in situ and hence not autochthonous    c   of limestone   : composed largely of organic debris moved far from the place where the base organisms lived   2  biology   : of foreign origin : introduced   compare autochthonous   | 
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