“两组”用英语怎么说？

两组都具有通常脊椎动物才具备的两个特征。Both groups share two attributes normally associated with vertebrates.两组之间发生过一些激烈的争吵。There've been some bitter exchanges between the two groups.研究者在计算机屏幕上显示出两组不同的字母。Researchers flash two groups o...