adj. 
胸的
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ectoskeleton,
ectosome,
ectosphere,
ectospore,
ectosporium,
ectostosis,
ectosymbiont,
ectothalamus,
ectotheca,
ectothecal,
相似单词
prothiocarb,
prothipendyl,
prothoate,
prothole,
prothonotary,
prothoracic,
prothorax,
prothrombase,
prothrombin,
prothrombinase,