The observational work is carried out on a range of telescopes.观测工作借助于各种望远镜。We have experimental and observational evidence concerning things which happened before and after the origin of life.有关生命起源前后发生了什么，我们通过实验和观察得出了一...
She laced his food with sleeping pills.她在他的食物里掺了安眠药。I was woken up by someone grabbing hold of my sleeping bag...有人猛地抓住了我的睡袋，把我惊醒了。By about 6 weeks of age, most babies begin to show something approximating a day/night sl...
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.地衣类植物生长速度慢,有好几年的寿命.其生长依赖于霉菌和海藻的共生.Lichens, which grow slowly and live for many years, result from fungi a...