arcs: 短语和例子ARCS =1.Associate of the Royal College of Surgeons (英国)皇家外科医师协会准会员。2.Associate of the Royal College of Science (英国)皇家科学协会准会员。3.Australian Red Cross Society 澳大利亚红十字会。
vacuum: n.(pl. vacuums, vac-ua )1.真空;空处,空虚,空白。2.〔美口〕吸尘器(= vacuum cleaner)。短语和例子a low [partial] vacuum低度[未尽]真空。 feel a vacuum in the lower regions 〔戏谑语〕觉得饿。vi.,vt.〔美口〕1.用吸尘器扫除。2.用真空干燥机干燥。adj.1.真空的。