hex

The linen micarta handle plates are attached with hex nuts and cover a hollowed tang with compartments for various survival items.

被服米卡处理板附有进制坚果和涉及掏空唐与隔间，为各种救生物品。

It's very difficult! but I think it should be "hexad", and "hex" left when we take away the last two letters.

一个什么样的五个字母的词，当你拿掉两个字母后还有个剩下？

Sandhoff results from a genetic mutation that reduces the body's supply of an enzyme, called hexosaminidase ("hex"), used by brain cells to metabolize excess fatty material called lipids.

由基因突变导致的山德霍夫氏病会减少体内的一种叫做己糖胺酶的供应，而脑细胞用它来代谢过多的脂质。