Human hearts are reciprocal.
人的心灵是相互回应的。
该句使用简单主系表结构，reciprocal准确表达相互作用的关系。
"Understanding is more crucial than mere affection."
"Tacit understanding begins with conversation and evolves into belief."
"There is no need for explanations to those who understand"
"Love is built upon a foundation of common understanding."
"Love without mutual understanding is unreliable—understanding must come before love."