epiphenomenon
noun [ C ] formal uk/ˌep.ɪfəˈnɒm.ɪ.nən/ us/ˌep.ɪ.fəˈnɑː.mə.nɑːn/ epiphenomena /ˌep.ɪfəˈnɒm.ɪ.nə/ /ˌep.ɪ.fəˈnɑː.mə.nə/
副现象，偶发现象
a phenomenon (= something that exists and can be seen, felt, etc.) that exists at the same time as another one but is not related to it
Are the observations clues to the cause of the condition or merely epiphenomena? 观察到的情况是病因线索还是副现象而已？