While there are major syntactic differences among the tools' aspect declaration style, the core AOP semantics are similar.
虽然工具的方面声明风格之间存在主要的语法差异，但是核心的aop语义是类似的。
2
Syntactic decisions will come up again when we take a look at semantics in the next section, and also affect tool support, which I'll discuss in Part 2.
当在下一节中查看语义的时候，语法决策还会出现，而且也会影响在第2部分中讨论的工具支持。
3
Symbols that cause syntactic errors for single use and require an escape character to change semantics.