1. A circular, double-stranded unit of DNA that replicates within a cell independently of the chromosomal DNA. Plasmids are most often found in bacteria and are used in recombinant DNA research to transfer genes between cells. 
   质粒在细胞中能独立于染色体dna而复制的圆形的，双链的dna单元质粒大多常发现于细菌中，在dna重组体研究中用来在细胞间传递基因
2. A segment of double-stranded DNA in which the nucleotide sequence of one strand reads in reverse order to that of the complementary strand. 
   回文结构含有双股脱氧核糖核酸的一部分，其中的核苷酸系列的一股颠倒顺序来读取即为互补的一股
3. Any of a group of DNA-containing viruses that cause conjunctivitis and upper respiratory tract infections in humans. 
   腺病毒导致人类结合腺类及上呼吸道感染的一组含有脱氧核糖核酸的病原体
4. Any of a group of DNA-containing viruses that are associated with or cause papillomas or polyomas in animals. 
   乳头状多瘤空泡病毒一种含dna的病毒，能引发动物乳头状瘤或多瘤病毒或与之有关的疾病
5. Any of a group of DNA-containing viruses, including those that cause smallpox, cowpox, and other poxlike diseases in vertebrates. 
   痘病毒一组含脱氧核糖核酸的病毒，包括那些在脊椎动物中引起天花、牛痘以及其他类似疾病的病毒

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