Successful gene therapy relies on safe and efficient gene transfer methods and high level expression of foreign gene.
基因治疗的成功有赖于安全有效的基因转移方法和高水平表达的外源基因。
Some of the safe mobile codes may be rejected to execute, since there is no way to verify statically that the symbol range value of an array subscript expression in PCC.
PCC的数组边界检查存在着由于无法确定数组下标表达式符号值的范围，而造成拒绝执行一些安全的移动代码等问题。
From this point, an algorithm is put forward to check whether the role expression is safe.
在此基础上，提出一种能够判断角色表达式是否安全的算法。
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