它们被称为虚粒子以便与实粒子区分开来而实粒子则不会以这种方式受到制约并且其存在可得以测定
They are called virtual particles to distinguish them from real particles, while real particles are not constrained in this way and their existence can be determined
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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