A flowing stream inarms a boulder in its passing.

流水围绕大石流过去。

He took my hand to help me over a boulder that blocked the way.

他牵我的手带我爬过那块挡道的卵石。

The river takes a headlong plunge into a maelstrom of rocks and boulders.

河水急流而下， 入一个漂砾的漩涡中。

They drilled boulder's for inserting dynamite.

他们在大石头上钻孔以便装炸药。

Bombproof -A hold or anchor that is thought to offer the utmost security; for example, a top-rope anchor around a large, stable tree trunk or immovable boulder.

非常可靠的支或保护，，在大树或者巨石上做的顶绳保护锚。