The magnetic field sensor for weld nuts detects not only metal but it also replaces the location bolt.

用于焊接螺母磁场传感器检测，不仅金属但它也取代了位置螺栓。

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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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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