在城市拆除爆破中，用小孔爆破法拆除重心很低、支承面大的浆砌片石构筑物难度很大。

It is difficult to demolish structure which has lower height of gravity center, larger supporting surface and mortar rubble with demolition blasting in city.

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你可把一块石头抛向一面石砌的墙。

You can throw a stone at a wall made of stone.

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你可把一块石头抛向一面石砌的墙。

You can throw a stone at a wall made of stone.

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