我们聊了一会天，不经意间提到我想要再买一顶这种帽子，可惜商店已经断货了。
We chatted for a few minutes and I mentioned that I'd tried to buy a replacement hat but the store had sold out.
依据典型浅埋煤层工作面的实测和模拟，发现了采场老顶初次破断的非对称现象。
By field observation and simulating test of shallow seam longwall mining, the phenomenon of main roof asymmetry breaking is discovered during the first weighting.
滚轮顶杆式断缆锁紧装置是武汉理工大学港机研究所开发的一种新型断缆锁紧保护装置。
Roller wheel and carrier rod protection system is a new pattern protection system which designed by the Research Institute of Mechanical for The Port, WuHan University of technology.
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