boulder是什么意思

boulder中文什么意思

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The definition of boulder varies from one case to another and depends on the mucking devices used and bucket volume .
大块的定义随具体条件而异，同时还取决于装碴机械和铲斗容积。
Gold and other heavy mineral placers are notable examples of lag deposits, but gravel and boulder bars are more common .
金和其它重矿沙虽是蚀余沉积物中值得注意的例子，然而卵石和顽石沙洲都是比较普遍的。
What a relief it was when the boulders suddenly disappeared , giving way to a stretch of plain where the only obstacles were clumps of bushes !
大石块突然消失，为一片平原所取代。这里除了一簇簇的矮树丛，别无障碍，这是何等令人欣慰啊！
See that big boulder over there under the pine tree
看见那松树下的大石头了吗
They drilled boulder ? s for inserting dynamite
他们在大石头上钻孔以便装炸药。