唱了個喏 They Make Their Bows
眾官接引，上了東閣，早見唐僧、國王、閣老，已都在那裡安排筵宴哩。這行者與八戒、沙僧對師父唱了個喏。隨後眾官都至。众官接引，上了东阁，早见唐僧、国王、阁老，已都在那里安排筵宴哩。这行者与八戒、沙僧对师父唱了个喏。随后众官都至。
逐句解 Line by line
The officials received them and brought them up to the Eastern Pavilion, where they saw the Tang Monk, the king and the grand secretaries already there, setting out the banquet.
那 is nà here, pointing: they were already there. The same two characters were a question at nǎ — where is he? — a few lines ago.
Pilgrim and Eight Rules and Sha the monk called out their salutation and bowed to their master.
喏 is rě, the salutation you call out while bowing, not the nuò of saying yes. Pilgrim has spent this chapter being bowed to — by the medical officers, the stewards, the court, and by the king on the floor of his own throne hall. Here he makes one, and it goes to his master.
The officials came in behind them.
The room is assembled and the narrator turns to the furniture.
The room assembles in three short sentences. The Tang Monk, the king and the grand secretaries are already there laying the banquet; the three disciples bow to their master; the officials come in behind them.
The bow is worth noticing. Pilgrim has spent this entire chapter being bowed to — by the medical officers, by the hostel stewards, by the assembled court, and an hour ago by the king on the floor of his own throne hall. Here he makes one, and it goes to Tripitaka.