Two types of viral symmetry have been recognized, the cubical symmetry and helical symmetry.已经证实病毒有两种对称型, 即立体对称和螺旋对称.The polynucleotide chain is helical.多核苷酸键是螺旋形的.The high laevorotation of L - cystine depends on a speci...
Successful prosecutions are possible but by no means guaranteed.成功起诉是可能的,但不是绝对的....the Director of Public Prosecutions...(英格兰以及威尔士的)检察官The two officers were being investigated by the director of public prosecutions.两名警官正...