The study is concerned with perforation of thick woven composite plates by hard steel cylinder.

本文对厚编织复合材料板由硬的钢圆柱弹丸穿孔问题进行了研究。

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A systematic experimental study has been conducted an mild Steel tubes of various thickness in their perforation by hard steel spheres.

本文通过实验研究了不同尺寸的硬质钢球弹丸对不同壁厚的低碳钢圆钢管的侵彻和穿孔效应；

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The divers also wear specialized dive suits and old-fashioned hard steel helmets so they can safely operate in contaminated water without being exposed to toxins.

潜水员们也经常穿着特制的潜水服和旧式的钢铁头盔，以使得他们在充满污染水体中不被侵害。

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He dug deep into the darkness, hitting the steel so hard that his body began to fail him.

VOA: special.2009.02.21

The strings on his boots were as hard as steel.

VOA: special.2010.05.01

It would take cold, hard steel, made from hot molten iron.

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It feeds through a stylus that is "as hard as steel, " says Mark Seetin of the U.S. Apple Association.

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And one day, a small group of churches on the South Side of Chicago answered, offering me work with people in neighborhoods hit hard by steel mills that were shutting down and communities where jobs were dying away.

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