登机时，他被反复地呼叫着。

He was paged repeatedly as the flight was boarding.

《柯林斯英汉双解大词典》

我们什么时候开始登机？

When do we start boarding?

youdao

他们在登机。

They're boarding.

youdao

Then quite a few children will understand what boarding pass is, so when they receive this, they thought the trip was almost real.

只有很少一部分孩子知道,登机牌是什么，因此当他们拿到登机牌时，他们都以为这趟旅行是真的。

麻省理工公开课 - 媒体、教育、市场课程节选

The children have a ticket in their boarding pass.

孩子们的机票放在登机牌。

麻省理工公开课 - 媒体、教育、市场课程节选

He also had the idea that he would make it narrow enough so that when you're boarding an airplane you can still roll it down the aisle of the airplane-- it just fit perfectly.

他还想到要将把手弄的窄一点,以便登机进通道的时候,还能拖着箱子走-,这非常符合当时的需要。

耶鲁公开课 - 金融市场课程节选