The first, or front, line of trenches was known as the outpost line and was thinly held by scattered machine gunners distributed behind dense entanglements of barbed wire.

第一条——或者说是最前方的壕沟被称为前哨壕，在密集缠结的铁丝网后分散布置了稀疏的机枪位。

youdao

The tariff barriers that are put up to repel this invasion are like the tank traps, trenches and barbed-wire entanglements created to repel or slow down attempted invasion by a foreign army.

设立关税壁垒以击退舶来品的入侵，就像布设坦克陷阱、战壕、铁丝网，用以抵御或延缓敌军的攻势。

youdao

He said it had been previously suggested that barbed wire or barriers could be erected as a safety measure.

BBC: Concern over Briton Ferry M4 and A48 bridge fall deaths

The fence consisted of seven or eight strands of high-voltage barbed wire, spaced about a foot apart, strung between tall poles.

WSJ: Escape From a North Korean Prison

There would be no barbed wire, heavy-handedness or ostentatious displays of weaponry in a country still haunted by such images.

CNN: Olympic memories: Munich