reciprocal

詞型變化：

副詞:reciprocally 名詞:reciprocality 

詞意辨析：

mutual, common, joint, reciprocal

這些形容詞均含“共同的、相互的”之意。
mutual: 著重彼此共有或共享，局限於雙方的關係。
common: 側重兩人或多人共有共同，但不暗示彼此間存在的等價關係。
joint: 強調至少兩人或兩方共同占用，側重指一個統一體。
reciprocal: 著重互惠，有來有往。

英文解釋：

名詞 reciprocal:

1. something (a term or expression or concept) that has a reciprocal relation to something else
2. (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7
   同義詞：multiplicative inverse
3. hybridization involving a pair of crosses that reverse the sexes associated with each genotype
   同義詞：reciprocal cross

形容詞 reciprocal:

1. concerning each of two or more persons or things; especially given or done in return
   同義詞：mutual
2. of or relating to the multiplicative inverse of a quantity or function

字典網

英文造句：

1. The reciprocal of impedance.
   導納阻抗的對等物
2. Involving interchange; reciprocal.
   涉及交換的; 相互的
3. They have a reciprocal agreement to combat terrorism.
   他們有相互配合的協定，共同與恐怖主義作鬥爭。
4. They show reciprocal affection to each other.
   他們表達了彼此之間的愛慕。