双 - pair, set, comparison

twins

pair

twins; twin

both parties; both sides

binoculars; field glasses

seed leaves (of a dicot); cotyledons; bud; sprout

Futabasaurus suzukii (species of plesiosaur)

double summit; twin peaks; twin-peaked mountain

Futaba College of Foreign Languages; FCFL

conjoined twins

bipolar disorder

two-way; bidirectional; interactive