双位述谓结构 two-place predication

双条件叙述 Biconditional Statement

双重描述法 double description method

双输入描述函数 [计] dual-input describing function ; DIDF

双向条件述辞 biconditional statement

双重描述框架 dual description framework

双向信息陈述 two-sided presentations

双波描述 double wave description