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Butter, margarine, and oily fish are all good sources of vitamin D.黄油、人造黄油和多脂鱼都含有丰富的维生素D。Renewable sources of energy must be used where practical.必须在可行的地方使用可再生能源。Interfering in-laws are the prime sources of the blues.喜欢指...
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n.原因( source的名词复数 )，[物理学]源，来源，起源...
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Interfering in-laws are the prime sources of the blues.喜欢指手画脚的姻亲最让人头疼。Its competitors such as stone, brick, metal and plastic are all derived from exhaustible mineral sources.其他竞争性材料如石料 、 砖 、 金属和塑料管都是从易被竭尽的矿产资源中提取的.We�...