echo命令中多余的括号被去掉了。

The unnecessary brackets (()) around the value passed to echo have been removed.

youdao

但是，设置器方法都集中在构造器中，代码更简洁了，去掉set前缀和末尾的圆括号也大大减少了视觉干扰。

But the fact that they are all gathered together in the constructor keeps things neat and tidy, and dropping the set prefix and the parentheses at the end reduces visual noise considerably.

youdao