Q: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
In the oxygen- and sulfur-containing aromatic rings , one of the electron pairs of the heteroatoms contributes to the aromatic system ( similar to the non-basic nitrogen-containing rings ) .
A:
In the oxygen- and sulfur-containing aromatic rings , one of the electron pairs of the heteroatoms contributes to the aromatic system ( similar to the non-basic nitrogen-containing rings ) , whereas the second lone pair extends in the plane of the ring ( similar to the primary nitrogen-containing rings ) .