For example the regular expression a (b (C)) has the subgroups (b (C)) and (C).

例如，正则表达式a (B (C))包含子组(B (C))和(C)。

youdao

The optimizer has been able to do algebraic simplification on a+a, instead generating 2*a, and on (c*b)*12 + c*b, instead generating (c*b)*13.

该编译器可以对a+a进行代数简化，即改为生成2*a，也可以对 (c*b)*12 + c*b 进行代数简化，即改为生成 (c*b)*13。

youdao

The optimizer has been able to do algebraic simplification on a+a, instead generating 2*a, and on (c*b)*12 + c*b, instead generating (c*b)*13.

该编译器可以对a+a进行代数简化，即改为生成2*a，也可以对 (c*b)*12 + c*b 进行代数简化，即改为生成 (c*b)*13。

youdao