umbra造句
1、lastcontactofumbra2、umbraandpenumbraofsunspot3、afringeregionofpartialshadowaroundanumbra.4、Thisisalighterareabetweentheumbraandtheedgeofashadow.5、Thisincludesthecontinuoussurveyofumbraandpenumb...
1、lastcontactofumbra2、umbraandpenumbraofsunspot3、afringeregionofpartialshadowaroundanumbra.4、Thisisalighterareabetweentheumbraandtheedgeofashadow.5、Thisincludesthecontinuoussurveyofumbraandpenumb...