asymmetric
adjectivehaving two sides or parts that are not the same in size or shape 不对称的 - (specialist)
not equal, for example in the way each side or part behaves 不对等的 Linguists are studying the asymmetric use of Creole by parents and children (= parents use one language and children reply in another). 语言学家正在研究父母和孩子使用克里奥尔混合语时的不对等现象（即父母使用一种语言而孩子用另一种语言回答）。 Terrorism is a response to asymmetric warfare (= between forces with very different sizes, weapons or methods). 恐怖主义是对不对称战争的一种回应。 Pilots need training in asymmetric flying (= when only one of two engines is working). 飞行员需要接受不对称飞行训练。
Word Originmid 17th cent.: from Greek asummetria, from a- ‘without’ + summetria (see symmetry) + -ic.