Called Virtual Particles Order Distinguish Real Lifetimes Constrained

意群训练： They are called virtual particle s in order to distinguish them from real particles , whose lifetimes are not constrained in the same way , and which can be detected .

标志： They are called virtual particles /in order to distinguish them from real particles, (whose lifetimes are not constrained in the same way,) and (which can be detected)/.

译文： 它们 被称之为 “虚粒子 ”/以用来与“实粒子”相区分，（后者的生命期不以同样的方式受到制约），而且 （能够被探测到）/。

解释： 本句的怪异之处在于，real particles后面跟着两个定语从句，都是同时修饰real particles的。而且两个从句之间还用逗号隔开，却又加上and连接，令人一眼看上去极不习惯。