求翻译：乙型肝炎病毒（hepatitis B virus, HBV）感染是目前严重危害人类健康的病原体之一，HBV 持续感染会导致急慢性乙型肝炎、肝损伤和肝硬化的发生，并且与肝细胞癌的发生密切相关，目前临床尚无根治乙肝的特效药物。研究发现[1] 壁虎提取得到的成份对人肝肿瘤生长具有显著的抑制作用且呈与时间和剂量的相关性，显示出诱导肿瘤细胞凋亡的作用。为了探讨HBV 感染后其对人肝癌细胞和人肝细胞生长状况的影响，本实验以HepG2 和HL-7702 细胞株为实验模型，了解提取物干预上述两种细胞后其AST、ALT、r-GT、LDH、HBV-DNA 含量及细胞凋亡的变化情况。是什么意思？

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The second grade hepatitis virus (hepatitis B virus, HBV) infects is one of present severely impair humanity health pathogens, HBV infects continually can cause the anxious chronic second grade hepatitis, the liver damage and liver cirrhosis occurrence, and with the hepatocellular carcinoma occurren

Hepatitis b virus (hepatitis b virus and HBV) infections are one of the pathogens present serious risks to human health, HBV infection can cause acute or chronic hepatitis, liver damage and cirrhosis, and closely related to the incidence of hepatocellular carcinoma, currently there is no cure hepati