Seven second-class passengers prepared to disembark.

7名二等舱的旅客准备下船了。

《柯林斯英汉双解大词典》

First-class passengers enjoy "élite" security lines and priority boarding, and disembark before the unwashed in coach, held at bay by a flight attendant, are allowed to foul the jet-way.

头等舱乘客享受“精英”安检通道，能优先登机，并能在被空乘人员管辖的经济舱普通民众“弄脏”移动通道之前，优先下飞机。

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Disembark for a few days to explore the Russian Arctic, the Silk Road or Moscow.

途中可以下车玩玩，去观赏极地风光、丝绸之路以及首都莫斯科。

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Passengers who had been standing, waiting to disembark, were hurled to the deck or launched into walls as the Seastreak hit the dock.

BBC: Seastreak Wall Street ferry crash hurts scores in New York

The Tarawa calamity was already a Pacific legend: how naval intelligence, relying on obsolete charts, had miscalculated the tides so flagrantly that the Marine troops in their landing vessels were forced to disembark on coral reefs and then wade ashore for hundreds of yards, exposed to killing fire from Japanese machine guns.

NEWYORKER: Rat Beach

Dale Connone was getting ready to disembark from the boat's side exit when the ferry crashed.

WSJ: A Low-Key Commute on the Water, Then, 'All of Us Standing Went Flying'