单词	二倍频
释义	二倍频 frequency conversion
随便看	difficultness difficultnesses difficult novel difficult of difficult of access Difficult processing gold mine stone difficult Taoist priest poets difficult of accomplishment difficult of approach difficult of explanation Difficult ore Difficult or impossible to endure Difficult or impossible to endure;intolerable difficult or impossible to extinguish difficult or impossible to impeach difficult or impossible to like Difficult or tedious Difficult papillotomy difficult part difficult parts difficult period difficult poeition difficult point difficult point in teaching difficult problems