词根：cumber = barrier, 表示“躺的东西, 障碍”

encumber v. 妨害，阻碍（en进入+cumber→成为障碍→妨害）

encumbrance n. 障碍物；妨碍（encumber+ance)

cumbersome a. 笨重的；碍手脚的（cumber+some有点…的→有障碍的）

词根词缀：numer-, number-

【来源及含义】Latin: distribution; to count, to reckon

【同源单词】alphanumeric, alphanumerical, alphanumerics, annumerate, annumeration, apocalyptic number