intermediary;medium;vehicle;agent;instrumentality ;

Blood is the medium in which oxygen is carried to all parts of the body.
血液是将氧气输送到人体各个部位的媒介。
来源:词典精选例句Television seems to be firmly entrenched as the number one medium for national advertising.
电视看来要在全国广告媒介中牢固地占据头等位置.
来源:《简明英汉词典》Blood is the medium in which oxygen is carried to all parts of the body.
血液是将氧气输送到人体各个部位的媒介。
来源:《柯林斯高阶英汉双解学习词典》Air, water, clothing and insects are all means of infection.
空气 、 水 、 衣服、及昆虫都会成为疾病的传染媒介.
来源:《现代汉英综合大词典》
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