但有时候你可以从表层一直挖下去，越挖越深。
But sometimes you start to uncover a bone and it just keeps going and going, deeper and deeper.
他向左爬了几码去挖下一株。他感到潮湿的泥土从蓝色牛仔裤的缝隙里渗进去。
As he crawled a few feet left to unearth another plant, he felt the moist dirt seeping its way through the knees of his blue jeans.
在这里挖下去，你就会发现卤水——充满盐分的水——富含最轻金属锂的沉积物。
Dig down and you find brine - water saturated with salt - rich in deposits of lithium, the lightest metal.
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