他们形成一个肌肉序列，与位于背部的腰方肌共同协作，上提脊柱。
They form a muscular column that works with the quadratus lumborum in the small of the back to lift the spine.
相反，蓝眼睛的人有一种褐色色素，被称之为黑色素，位于虹膜背部，但在虹膜前部黑色素浓度较低。
Instead, people with blue eyes have a brown pigment, known as melamin, at the back of their irises but have low concentrations of melanin in the front of their irises.
它们的主太阳能和稳定板安装在背部，直接位于主反应堆上方。
Their principal solar and stabilizer fin, mounted dorsally, is located directly above the main reactor.
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