是修饰前面的动词，在这里应该用 Gently.副词修饰动词作状语。
As the small boat moved, gently along the river he was left speechless by the mountains being silently reflected in the water.
可以理解为修饰moved;
或者可以这样更好：（逗号移个位置）
As the small boat moved gently along the river， he was left speechless by the mountains being silently reflected in the water.
当小船在河上缓缓移动时，山在水中的倒影让他说不出话来。
逗号移一下位置。那就是修饰moved
by the mountain being silently reflected in the river 静静地映在河里的山
being silently reflected in the river作定语，修饰the mountain
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