从地空导弹对所保卫目标的掩护能力、火力转移能力等方面，论述杀伤区远界与防卫效率的关系。

The relationship between Killing zone boundary and defense efficiency is expounded from the point of view of covering protected object capability by air-defense missile and its shift of fire.

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结论：逆转录病毒介导的HSV - TK系统对人胃癌细胞有较高的转染效率，GCV对转染阳性的胃癌细胞有显著的杀伤作用。

Conclusion: transfection of gastric carcinoma with HSV-TK has higher transfection efficiency. MKN28TK cells are significantly sensitive to GCV.

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