extraneous
/ekˈstreɪnjəs/adjective
1- irrelevant or unrelated to the subject or matter being dealt with无关的：
one is obliged to wade through many pages of extraneous material.
人们不得不苦苦读完很多页无关的材料。
1.1
- of external origin外源的; 外来的：
when the transmitter pack is turned off no extraneous noise is heard.
关掉发射机组件后就听不到外面的噪音了。
1.2
- separate from the object to which it is attached与所属母体（或主体）分离的：
other insects attach extraneous objects or material to themselves.
其他昆虫把不与母体连在一起的东西附着在自己身上。
派生词
extraneously
adverbextraneousness
noun词源
mid 17th cent.: from Latin extraneus + -OUS.