The ancient collapse is a familiar ill geologic phenomenon in karst region, usually it is unsuitable for direct ground bearing stratum.

古塌陷是岩溶地区的一种常见的不良地质现象，一般不宜作为建筑物地基直接持力层。

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Non-ground neutral system and arc-suppression-coil-ground neutral system are called non-direct ground neutral system that is widely used in power distribution system.

中性点不接地系统和中性点经消弧线圈接地系统统称为中性点不直接接地系统，广泛应用于铁路配电系统中。

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The direct ground contact protects the Juggernaut from electromagnetic attacks and shield discharges.

直接接触地面可使“主宰者”免受电磁攻击和护盾流失。

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The B-1 is a strategic bomber that was not originally designed to provide direct air support to ground forces, which was the mission in this instance.

VOA: standard.2009.06.08

Technically, women are still barred by Congress from serving in direct ground combat -- a distinction that seems increasingly disconnected from the reality of modern warfare.

CNN: Behind the Scenes: Saluting a female general

The military bans women from direct ground combat, but already in the course of the Iraq War, more than 30 female service members have lost their lives.

NPR: Women in Combat: Rules and Reality

The new facility near Tongchang is far more advanced, with a 100-foot-tall launch tower and a below-ground tunnel to direct rocket exhaust.

WSJ: U.S. Warns North Korea Over Rocket Launch