hex

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

该被服米卡处理板附有十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.

一个什么个字母词，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.

由基因突变导致山德霍夫氏病会减少体内一种叫做己糖胺酶供应，而脑细胞它来代谢过多脂质。