Crystals having this property are said to be doubly refracting , or birefringent.具有这种性质的晶体叫做双折射晶体.Such substances are optically anisotropic and birefringent.这种材料是光学各向异性的,因而是双折射晶体.The stressmeter consists of a short solid...
The dead elms have been replaced by a row of saplings.枯死的榆树已被移去而换栽了一排幼树.The saplings should be two metres apart.每棵树苗要隔开两米.The saplings are budding.小树抽出了嫩芽....
计算机甚至会开处方.Computers can even write out prescriptions.为什么医生会和病人一起来还开处方?Why would a doctor come with her patient to fill out a prescription?对不起, 医生忘给您开处方了.I am sorry. Your doctor forgot to write your prescription....