这几句DNA合成的句子，帮翻译成英文吧

Synthetic genes present there are two main methods. 一条途径是以目的基因转录成的信使RNA为模版，反转录成互补的单链DNA，然后在酶的作用下合成双链DNA，从而获得所需要的基因。 One way is to target gene transcription into messenger RNA as a template, reverse transcription into a complementary single-stranded DNA, and then under the action of the enzyme synthesis of double-stranded DNA, and thus obtain the necessary genes. 另一条途径是根据已知的蛋白质的氨基酸序列，推测出相应的信使RNA序列，然后按照碱基互补配对的原则，推测出它的基因的核苷酸序列，再通过化学方法，以单核苷酸为原料合成目的基因。 Another way is based on the known amino acid sequences, suggesting the corresponding messenger RNA sequence, and then follow the principle of base pairs, suggesting a nucleotide sequence of its genes, and then by chemical methods to single-nucleotide acid was synthesized from the target gene.

A synthetic gene now there are two main methods. One way is to aim the transcription messenger RNA, reverse transcriptase into the single DNA, then complementary in under the action of enzyme, DNA synthesis of double-stranded needed to obtain th