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。
