contraction

contraction x contraction under contraction什么意思? A contraction是什么意思 contraction ,abbreviation的区别? contraction shinkage 的区别 lanthanide contraction是什么意思 twitch contraction是什么意思 abbrevition与contraction的区别 abbreviation与 contraction有何区别 数学里的“contraction”在汉语里是什么意思? 十万火急 Change the words “they have” into a contraction