Repair worn parts of metal products by welding on extra layers.

通过焊接额外层，修复金属制品的磨损零件。

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Add extra layers of cardboard to the corners of your box and use plenty of Duct tape to hold it tight.

在盒子的角落处添加几层硬纸板，用大量胶带缠牢。

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For this reason, AOL has partnered with a few companies to provide software that offers extra layers of protection.

出于这个原因，美国在线结合几家公司提供软件试图提供额外的防卫。

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And those who have deployed it--if they're smart--generally do so only after adding extra layers of security.

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At the moment Jenny plans to bring in additional musicians to add extra layers to her poignant sound.

BBC: BBC Introducing: Jenny Bishop

Pennsylvania has ordered drillers to use extra layers of pipe at those depths.

FORBES: Energy