单词	periscope
释义	peri·scope \ˈperəˌskōp\ noun Etymology: International Scientific Vocabulary peri- + -scope : an optical instrument by which an observer (as on a submerged submarine or in work with highly radioactive materials) looks through or as if through an eyepiece into a mirror or totally reflecting prism attached at an angle of 45 degrees to one end of a tube containing a system of lenses and obtains an otherwise obstructed field of view from another mirror or prism correspondingly attached to the other end of the tube
随便看	unrevealing unrevenged unrevengeful unreverenced unreverend unreverent unreversed unreviewable unrevised unrevived unrevoked unrewarded unrewarding unrhetorical unrhymed unrhythmic unrhythmical unribbed unrid unridden unriddle unriddler unrifled unrig unright

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