Opener

来自Big Physics
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wiktionary

ref 

open +‎  -er


etymonline

ref

opener (n.)

"one who or that which opens," Old English openere, agent noun from open (v.). As "a tool or machine used in opening," c. 1600.

取自“https://www.bigphysics.org/index.php?title=Opener&oldid=27375”