We want to unfold the foils so that we can examine and image the tiles using transmitted illumination (light from below the tile) rather than reflected illumination (light through the microscope objective lens).

• 我们打算打开衬板这样就能用透射光（光线从凝胶块下面照过来）而不是反射光（光线从显微镜物镜处照过去）照明来对凝胶块进行检查、拍照。