闭包嵌套 变量如何使用？

    $data = Conference::pluck('date','date')
                ->flatten(1)
                ->all();
    return Admin::content(function (Content $content) use ($data) {
        $content->header('会议');
        $content->description('列表');
        $content->row(function (Row $row) use ($data) {
            $row->column(6, function (Column $column) use ($data) {
                $column->append((
                    new Box(
                    $data, $this->grid()
                )));
            });
        });
    });
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    图中代码涉及到闭包嵌套，除了逐级传递还有什么方法使用$data变量嘛Copy