So that, now when I send a packet, when I send a message, the packet will flow from SF1.

现在当我发送一个报文时，当我发送一个消息时，报文会经过SF1。

youdao

Here I have four instances. Like, one is my source. This is my source, this is my SF1, this is my SF2, this is my destination.

这里有四个实例，这个是源，这个代表源主机，这个代表sf1，这个代表sf2，这个代表目的主机。

youdao

Genome DNA was extracted from peripheral blood, exon 1 and exon 2 of DAX1 gene were amplified by PCR for sequencing, and mutation screening of SF1 gene (exon 2-7) was conducted.

抽提外周血基因组dna，对DAX1基因2个外显子(外显子1和2)的PCR扩增产物进行测序分析；无突变者行SF 1基因(外显子2 ~ 7)突变筛查。

youdao