He was helping to demolish an underground garage when part of the roof collapsed.
He was helping to demolish an underground garage when part of the roof collapsed.
他当时正在帮忙拆除一个地下汽车库，屋顶的一部份突然倒塌。
He was helping to demolish an underground garage when part of the roof collapsed.
他当时正在帮忙拆除一个地下汽车库，屋顶的一部份突然倒塌。