您的组织是否拥有熟练人员？
第一，很多双击是由锤击试验的新手或者不熟练人员造成的。
First, many double impacts occur due to new or inexperienced impact testers.
然而，项目还受到缺乏愿意到利比里亚工作的熟练人员的困扰，Palsson说。
But projects have also been hampered by lack of skilled personnel willing to come to Liberia to work, Palsson says.
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