为摸清西昌市生猪旋毛虫感染的强度和分布情况，我们对从我市4个定点屠宰场采集的生猪血清和膈肌进行检验。

For investigating Xichang pigs trichina infection condition, we examined the muscle and serum from 4 specifying slaughter house in Xichang.

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一旦该系统建立起了，研究小组又检验HCV携带者的血清能否感染人类胎儿肝细胞。

Once the system was established, the group examined whether sera from patients carrying HCV could infect the human fetal hepatocytes.

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一旦该系统建立起了，研究小组又检验HC携带者的血清能否感染人类胎儿肝细胞。

Once the system was established, the group examined whether sera from patients carrying HC could infect the human fetal hepatocytes.

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