Before revision: Whirlpool — a vortex analogous to that created by water draining above a strudel A strudel (plural: URL plural form was recommended, and used, by E. Reimnitz and his colleagues.
After revision: ThisWhirlpool — a vortex analogous to that created by water draining above a strudel A strudel (plural: URL plural form was recommended, and used, by E. Reimnitz and his colleagues.