There are different direction twins in its casting structures, and parallelsecond twins emerge in one big twin where micro cracks appear along twin boundary.
铸态组织中存在不同位向的孪晶,大孪晶中有许多平行的二次孪晶,沿孪晶界诱发微裂纹;
2
As E-mail and Web browsing have given way to virtual reality games, intelligent cell phones, and social networking, we are each developing a second, parallel, existence.