单词	原生天然气
释义	原生天然气native gas
随便看	keep a firm hand on ... keep a firm(或tight)grip on keep a firm (或tight) hand on keep afloat keep a foot in both camps keep after keep a good cellar keep (a good) heart keep a good heart keep a good house keep a good lookout keep a good lookout for keep a (good, sharp) lookout (for) keep a good table keep a good table(或house) keep a grip on ... keep ahead keep ahead of keep a jealous eye on keep a lid on keep alive keep-alive keep-alive circuit keep-alive current keep-alive electrode