Things might have been going very well between us — we had had a good day for instance visiting Chataqua Park in Boulder — when suddenly the dragon came out of his lair and began spitting fire.
在我和乔安娜之间，多年来，有一点在一直被奉行着，"当愤怒之龙突然显现出并要喷发时"，我们取而代之的就是去博尔德的Chataqua公园度过快乐美好的一天。
Results of author's experiments show that this grade error tends to increase with the decrease of sampling volume and the increase of the boulder content as well as sorting coefficient of the placer.
笔者所做的砂金取样规格试验表明，砂金品位误差随着取样体积减小而增大。
When large dismeter water well is constructed in cobble and boulder strata drilling by percussion machine is not proper to be used as limited by condition.
卵砾石地层钻进是钻探的难题之一，不仅钻进速度低，钻头的使用寿命短，而且钻探成本高。
When large dismeter water well is constructed in cobble and boulder strata drilling by percussion machine is not proper to be used as limited by condition.
卵砾石地层钻进是钻探的难题之一，不仅钻进速度低，钻头的使用寿命短，而且钻探成本高。
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