Clearances for the control rods may be impaired by obstacles in the path of the rods.

棒间隙的控制杆受损，可通过在路径的障碍。

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The results show that the great differences between the soil fertility of control burning and that of non-burning are resulted by the different ground clearances.

结果表明：采伐迹地的不同清理方式导致了林地肥力的较大差异。

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The combination is subject to customary regulatory and other approvals, including merger control clearances, and is expected to complete in the second half of 2013.

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The FAA said the revocations cite several violations of regulations, including failure to comply with air traffic control and clearances and operating carelessly and recklessly.

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Air-traffic controllers currently use traditional radio transmissions to issue taxi clearances, while pilots manually control planes and peer out cockpit windows to spot potential collision hazards.

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