石蕊: 从几种地衣类植物中获取的带色有机化合物的混合物.Litmus: Mixture of coloured organic compounds obtained from several species of lichens.例如石蕊和酚酞.Examples are litmus and phenolphthalein.它能改变指示剂的颜色,使石蕊和通用指示剂变蓝.It can change the color of the ind...
George has made himself cheap by his dishonorable behaviour.乔治品行不端,使自己名声扫地.I thought that they were understating the benefit from cheap consumer goods.我原以为他们理解便宜的消费品给他们带来的好处.Use a cheap cut such as spare rib chops.用一块便宜点...
大自然最让人惊叹的是它的无限多样性。The most amazing thing about nature is its infinite variety.我们一点都不抵触多样化；实际上，我们需要多样性更丰富一些。We have nothing against diversity; indeed, we want more of it.自然环境保护主义者大多致力于保持物种的多样性。Conservationists are mostly ...