1.the mystery of ……的谜题;……的奥秘
The mystery of how brain cells are killed off by degenerative neurological diseases is no different.
关于脑细胞是如何被质变的神经疾病杀死的奥秘跟这没有什么不同。
2.a fragment of 一块..的碎片
I am a fragment of a mirror whose whole design and shape I do not know.
我是一块镜子的碎片,我不知道镜子的完整的形状。