translation.en: But at the time when I started this project, the best explanation I could find for penal erection was that the wall surrounded these spongy tissues, and the spongy tissues filled with blood and pressure rose and voila! it became erect.
translation.zh: 但是在我刚开始着手这个课题的时候 我可以找到的最好的阴茎勃起的理由是 因为它有包围海绵组织的外壁 和充血的海绵组织 随着压力增强, 好, 它勃起了