This problem is commonly referred to as head-of-line blocking.

这个问题统称为 head-of-line blocking（对头阻塞）。

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Outside at the head of the line, Luca and Andre Bucci of Hamilton, Ontario are almost to the door.

VOA: standard.2010.02.16

Pulling this lever or pushing the button would actually rotate the paper enough so that you'd be on a new line and it would also move the little imprinting head that prints the letters of the alphabet and such all the way to the left.

拉杆或按下按钮会让纸翻一下,这样你就能在新的一行上打字了,同时移动打印字母的,压印头,这样也能移到最左边。

哈佛公开课 - 计算机科学课程节选

At the head of the line outside, an employee wearing a Vancouver 2010 fleece jacket greets visitors, making sure to thank them for their patience.

VOA: standard.2010.02.17

"Last year we had around 20 we brought to the head of the line, " Mr. O'Hanlon says.

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Louis Mayor Francis Slay told CNN it was an "insult" that rural projects were at the head of the line.

CNN: STORY HIGHLIGHTS

But Illinois is at least standing ready, at the head of the line, for the day when the gates open.

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