hěnduō jǐngdiǎn búshì mǎile piào suíshí jìn, érshì àn yùyuē shíduàn rùyuán

很多景点不是买了票随时进，而是按预约时段入园。

Many scenic spots do not allow you to enter at any time after buying a ticket, but require entry during a reserved time slot