Then, on the bottom of each triangle, he found the midpoint and connected those.然后,他找出每个三角形底边的中点,并将这些中点都连起来。The line obliqued from the base.这条线和底边成斜角。Somebody's fingerprints are all along the bottom edge of the photograph.照片的底边满是指纹。The hemline falls just above the knee.底边刚到膝盖。I shortened/raised the hemline on the dress.我把连衣裙的底边缩短/加长了。