You have the ability to add new data types or elements of the message tree for use in the expression.

您可以添加消息树的新数据类型或元素，以便在表达式中使用。

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Solving the Expression Problem makes it possible to extend preexisting types to new methods and extend preexisting methods to new types, all without recompiling existing code.

解决表达式问题使将先前存在的类型扩展到新方法成为可能，所有这些都不重新编译现有代码。

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The new findings show that the virus both kills cancer cells and stops the expression of the molecules which certain types of cancer cells produce to hide from the immune system.

这项新发现表明，VSV病毒不但能杀死肿瘤细胞，而且还能终止某些分子的表达，有些肿瘤就是通过产生这种分子而躲避免疫系统的监视。

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