A mole burrows its way through the ground 鼹鼠会在地下钻洞前进。
3.
Drilled and tapped 钻洞攻螺
4.
For weeks at a time they would hold on steadily , day after day ; and for weeks upon end they would camp , here and there , the dogs loafing and the men burning holes through frozen muck and gravel and washing countless pans of dirt by the heat of the fire 有时他们会一天接一天，一连走好几个星期；有时则随处扎营，停留几个星期，人们用火在冻结的腐殖土和沙层上钻洞，淘洗数不清的盘盘泥沙，狗则无所事事地闲逛。
