expression
Used to contrast two situations, often with a sense of replacement or trade-off. Appears in the pattern Aに引き換えてB, meaning 'in contrast to A, B' or 'instead of A, B'.
去年の冬に引き換えて、今年は暖かい。
In contrast to last winter, this year is warm.
兄が社交的なのに引き換えて、弟は無口だ。
While the older brother is sociable, the younger brother is quiet.
From the verb 引き換える (to exchange) in the て-form, used as a conjunction-like expression.