辐射对生物体的影响the biological effects of radiation变形虫是很简单的生物体.The amoeba is a very simple organism.他们比较了与不同材料接触时这些生物体的反应。They compared how these organisms behaved when left in contact with different materials....
琳达, 把电唱机关小声点, 我想看书.Linda, turn down the record player. I'm trying to read.我去年买了一台电唱机.I bought an electric gramophone last year.还附带一只电唱机.There's a pickup attached to it....
发言人的声音被叫嚷声盖住了，课堂一片混乱，老师们不得不好言相劝。Speakers have been shouted down, classes disrupted, teachers made to grovel.学校组织的出游能让孩子们获得在课堂上得不到的亲身体验。School trips give children firsthand experience not available in the classroom.她在课堂上嚼...