As an important detecting tool, there are many key technology to be solved, so TEM soundings is limited in the shallow geologic structure exploration.

但是作为一种重要探测工具，瞬变电磁仪的许多关键技术还没有解决，限制了瞬变电磁勘探法在工程勘探领域的应用。

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France was recently reported to be taking soundings, with a view to possible investment in Afghanistan.

ECONOMIST: Central Asia