Update item6.md

Optimize translation
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@ -100,7 +100,7 @@ auto ep = static_cast<float>(calEpsilon());
````cpp
int index = d * c.size();
````
但是这种写法并没有明确表明你想double类型转换成int类型显式类型初始器可以帮助你正确表意
但是这种写法并没有明确表明你想将右侧的double类型转换成int类型显式类型初始器可以帮助你正确表意
````cpp
auto index = static_cast<int>(d * size());
````