My right toe struck against a submerged rock.

我的右脚趾撞到一块水面下的石头。

《柯林斯英汉双解大词典》

When an underwater volcano pushes submerged rock to the surface, a new island is created.

当海底火山将水下的岩石推到表面时，一个新的岛屿就形成了。

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I have collided with submerged rock.

我船与水下岩石相碰。

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It was originally built as a refuge for sailors after the semi-submerged rock caused a number of shipwrecks.

BBC: Tower of Refuge walk 'attracts thousands'

It was tied to a tree and was rubbing against a half-submerged rock.

NEWYORKER: Max at Sea

Once you plunge in you find sections that alternate between slow streams where you can beach yourself against a flat half-submerged rock, and fast currents of waterslide fun.

BBC: The secret swimming holes of Vermont