起重机或其它重型机械移开大块的混凝土板，以便市民进一步用铲子去挖寻失踪者。
Cranes and other heavy equipment lifted slabs of concrete, allowing residents to dig for the missing with shovels.
在填充混凝土之前，它们相当轻，能够很快组装而不需要大型起重机或其他重型设备。
Before they are filled with concrete they are light enough to be installed quickly, without the need for large cranes or other heavy-duty equipment.
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