他尝试着把牙齿放入牛奶 、 水和细胞培养液中.He tried putting teeth into milk, into water, and into cell - culture medium.然而, 在家里或学校里很少人手边有细胞培养液.However, few people keep cell - culture medium handy at home or in school.细胞 培养液 能够最好地在口外保持掉牙健康.T...
Each morning cleaners make sure everything is spotless.每天早晨，清洁工们会把一切都打扫得干干净净。Vacuum cleaners work by suction.真空吸尘器靠抽吸除尘。He travels in vacuum cleaners.他到各地推销吸尘器....
艾滋病是所有人唯恐避之不及的东西。The universal bogey is AIDS.我们赶着往前走,唯恐会迟到.We hurried along for fear we should be late.我们从他窗前经过时, 放轻了脚步, 唯恐打扰他.When we passed his window, we stepped softly, for fear of disturbing....
大多数海洋腹足纲软体动物在某些幼体阶段形成一种有纤毛的游泳器官。Most marine gastropod mollusks develop a ciliate swimming organ in certain larval stages.我那不怕疲劳的小纤毛每秒钟约做10次清扫动作.My tireless little cilia make about ten sweeping strokes a second.健康的皮肤, 粘膜...