词汇	observation well
释义	observation well 观测孔
随便看	involuntary stop involuntary stoppage involuntary striated muscle involuntary system involuntary transfer involuntary treatment Involuntary trembling involuntary trust involuntary trusts involuntary twitching of head involuntary unemployment Involuntary unemployment is pervasive Involuntary unemplyment is pervasive involuntary up-grade involuntary up-gradeiug involuntary urination involuntary urination or defecation Involuntary vocalization involuntary withdrawal involuntomotory involunto-motory involup involurin involutant Involutarena