Railway equipment industry is worth digging deeper.
铁路设备行业值得深入挖掘。
Knowledge is like the spring water under the sand, more digging deeper water more clearly.
知识好象砂石下面的泉水，越掘得深泉水越清。
However, digging a little deeper reveals this definition is too narrow.
然而，再往下发掘一点点就会发现这样的定义太局限了。
He kept digging. The hole got deeper and the dirt pile got higher.
他不停地挖。坑越来越深，土越堆越高。
He kept digging. The hole got deeper and the dirt pile got higher.
他不停地挖。坑愈来愈深，土越堆越高。
He kept digging. The hole got deeper and the dirt pile got higher.
他不停地挖。坑愈来愈深，土越堆越高。
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