To settle loose bed, quick sand and ingress of groundwater are trouble some problems during coalmine construction.

如何解决煤矿建井中的松散层、流沙和地下渗(涌)水是目前建井工程中的棘手问题。

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The reducing in water production of tube well is a familiar problem, especially in the loose bed of the quaternary system.

管井出水量减少是常见的问题，特别是第四系松散层中的管井更为普遍。

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Moreover, there are some other influencing factors such as: thick loose bed, surface mining degree, impel speed of working face, coal mining and roof manage methods, mining procedure and time.

此外，厚松散层、地表采动程度、工作面推进速度、采煤方法与顶板管理方法、开采程序及时间因素等对采场覆岩空间结构均有一定影响。

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New reserves are much tougher to find and must be pried loose from wily dictators or from deposits deep under the ocean bed or in sandpits--and that costs big bucks.

FORBES: The Big Plunge

Wales loose-head prop Gethin Jenkins has booked his first-class flat bed to South Africa along with Scotland's Euan Murray, Vickery and England's Andrew Sheridan, who's coming back to form with Sale.

BBC: Jeremy Guscott column