词汇	obscuration of not knowing
释义	obscuration of not knowing. 所知障:
随便看	the Board of Banking Supervision The board of director the board of directors the Board of Governors the board of green cloth the board of health The board of honour the board of shareholders the board of supervisors the board of trade The board opposed his motion… the boards The boards broke The boards broke,and Amos fell into the well The boards creaked The boards fit neatly The board split in half the board structure The boar ran away the Boasian tradition The boast The boat began to drop down with the tide The boat brought back a big catch of fish The boat capsized in heavy seas The boat carried with much cargo in its belly