在5小时之后就完全失去了力学强度的翻译：5 hours after the total loss of mechanical strength 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

5 hours later completely lost the mechanical strength

5 hours after the total loss of mechanical strength

After 5 hours on has lost mechanics intensity completely

in 5 hours after the mechanics completely loses intensity

5 hours after the total loss of mechanical strength