This would seem to be a complimentary term, but in point of fact it is not, for it has picked up associations of impracticality and ineffectuality and general dopiness.
RNA is complimentary to DNA though, so if an RNA strand has a nucleotide sequence 3' - A A G U C C A G U - 5', then the complimentary DNA or cDNA would be 5' - T T C A G G T C A - 3'.
但RNA与DNA之间互补,所以如果一条RNA链拥有如下核苷酸序列:3' - A A G U C C A G U - 5',那么与之互补DNA便是5' - T T C A G G T C A - 3'。
Topics in English which should never be broached include one's personal life, physical appearance (unless complimentary), income, and age as well as religious, sexual, or political views.