maser造句 (31) In this paper, we study the magnetron cavity used in atomic hydrogen maser. (32) The paper describes the hydrogen storage principle of the LaNi alloys and its application in the Hydrogen Maser of Shanghai Astronomical Observatory .英文造句autocartime-lapsecross-stitchlordlinessbe on leavelandscape paintingtabuburnsideprecipitancecost pricepolitical leaderforeign investorwell-foundprognosecourse of studywhistle-blowerbrasiershort-hairedsleeping roomlose contact withkitchen tablechelonianmain enginestarter motorastronauticacellulartransmission delaycurrent timetransmission time