Smaolach had dug a hole deep enough to reach a layerof dry needles and cones.
斯茂拉赫已经掘了个洞，深度足以到达下层的针叶和球果。
2
In the back of your eye there is a thin layerof tissue that contains millions of tiny light-sensing nerve cells called rods and cones. Cones respond to specific wavelengths of light.
眼睛后方，存在一种包含数百万感光神经细胞的薄层组织，我们称之为杆状细胞、圆锥细胞。
3
Tuff cones are formed when magma from an inland volcano reaches the sea, sputtering layer upon layer of basalt ash that eventually rises into this monument of nature.