做一个双层金属箔（大约14英寸见方），在上面划三道口。
Form a double thickness of heavy-duty foil (about 14 in. square); cut three slits in foil.
伦巴第先生在一丛较厚的灌木中清出了一个三英尺见方的空地，让后将碎枝铺在地上隔绝寒冷的地气。
Lombard next chose an unusually high and thick clump of brush, and cleared a small space three feet across in the centre of it, scattering twigs on the uncovered earth to keep off its chill.
我想大约是三英尺见方。
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