Have you been standing in line, milling around with the crowd, in front of a wall of nothing?

你是否仍在一道空的墙前面排队等候，与群众一起兜圈子呢？

youdao

He went and stood in front of a blank brick wall, and his friends arranged themselves in a line behind him.

我那位朋友便心生一计，他走到一道空的砖墙前站着，而他的朋友也在他后面排队。

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Not far from this place, the soldiers in the Macedonian front line noticed the wall that had been built by Ariobarzanes.

没有远离这个地方，士兵们在前线马其顿发现墙上已经建立了Ariobarzanes。

youdao

The squash court has a line on the front wall.

WSJ: Squash and Schooling

There's absolutely no doubt in this case because these guns are not just going to Morocco, which is party to a conflict in the past about a territory, they're actually going into the middle of the disputed territory on the front line, on the large wall that the Moroccans have built across this disputed area.

BBC: News Online

Tim, on the other hand, understands that success comes down to whether one of his 50, 000 front-line associates with a few discretionary minutes decides to lean against a wall or clean tables.

FORBES: Four Reasons Why Leaders Lack Influence