qt 中tr()的头文件是什么?:‘tr’ was not declared in this scope,如何解决？

我是在这加的
class GoToCellDialog:public QDialog,public Ui::GoToCellDialog
{
Q_OBJECT
// QObject::tr();
}

fontComboBox = new QFontComboBox(groupBox);
fontComboBox->addItem(tr("/home/apuser/qt6"));
fontComboBox->addItem(tr("/home/apuser/qt1"));
connect(fontComboBox,SIGNAL(activated(int)),this,SLOT(doSelectFont(int)));

:‘tr’ was not declared in this scope

你把tr换成QObject::tr