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Polar surface waters most likely will become undersaturated for aragonite before the end of this century.
在本世纪结束前，极地海水表层很有可能变得对霰石不饱和。
In algebraic geometry, given a projective algebraic hypersurface C described by the homogeneous equation
and a point
its polar hypersurface Pa(C) is the hypersurface
where ƒi are the partial derivatives.
The intersection of C and Pa(C) is the set of points p such that the tangent at p to C meets a.
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