What is the best summary for this
part of the passage?
There is probably a link between
bilingualism and mental function, and
more experiments will prove this.
Similar experiments have produced
different results, so more are needed to
link bilingualism and brain function.
Researchers in the medical field must
do more experiments to learn about
the brain's functions besides language.
Debating the advantages of being
bilingual wastes time, so researchers
should try to work together more.