The anchorage quality, the loading status and the bolt integrity are of most concerned in the field.

锚杆的锚固质量、承载状态和完整性是该领域的研究重点。

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The field experiment of rockbolt nondestructive detection was selected in Chacheng Mine, the results perform the dynamical characteristics of prestressed bolt supporting system.

在垞城矿进行了预应力锚杆的现场无损检测试验。试验结果表明：数值模拟结果真实地反映了预应力锚杆支护系统的动力特征。

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According to actual case of thermal recovery in oil field, strengths were checked on pretighten force and working state, and the rigidity was test for failure bolt.

根据油田热采现场的实际应用情况，对失效螺栓进行了预紧状态以及操作状态的强度校核，并进行了硬度测试。

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Five boys aged between 16 and 18 were admitted to hospital on Tuesday after a lightning bolt hit a cricket field at their school.

BBC: South Africa pupils in hospital after lightning strikes

But Bolt kept calm and surged ahead of the field, slowing down as far as 20 meters from the finish as he allowed training partner Daniel Bailey of Antigua to gain ground on him.

CNN: Bolt smashes own record to win world 100m title

Earlier this week, Usain Bolt was stopped from bringing his iPad into the Olympic Stadium due to strict rules forbidding advertising on the field of play.

FORBES: At London Olympics, Usain Bolt's iPad Rejected But Minis Are More Than Welcome