取120个值计算平均数。Take a hundred and twenty values and calculate the mean.就像歌里唱的那样，两者密不可分，不能只取其一。You can't have one without the other, as the song says.她可以打电话点餐，叫人来取要洗的衣服以及叫其他各种服务。She could ring for food and drink, laundr...
烧橡胶的刺鼻气味the pungent smell of burning rubber橡胶是稀少而宝贵的, 可是俄国对橡胶的需要量是非常大的.Rubber was scarce and precious, and the Russian demand for it was on the large scale.该光谱表明,聚乙稀类物已经迁移到人造橡胶的表面.The spectrum indicates that a polyethyle...