Old English æl "eel," from Proto-Germanic *ælaz (cognates: Old Frisian -el, Middle Dutch ael, Dutch aal, Old Saxon and Old High German al, German Aal, Old Norse all), which is of unknown origin, with no certain cognates outside Germanic. Used figuratively for slipperiness from at least 1520s.
权威例句
1. The relationships between ambient temperature and ADMR, AME, EDM, EEL, TDMR, TME, plasma T 3 concentration were curvilinear.