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。

youdao

Railway equipment industry is worth digging deeper.

铁路设备行业值得深入挖掘。

youdao

Railway equipment industry is worth digging deeper.

铁路设备行业值得深入挖掘。

youdao