Locate digits 0-9 into the grid (no more then one digit per cell). Each digit is used exactly twice. Cells with digits cannot touch each other even by a corner.

在图中填入数字0-9各两个，每格最多填一个数字，填有数字的格子彼此不能有边或者角相接触。

youdao

Even more surprisingly, they found that each receptor, located on the surface of a particular cell, is unique, and when activated by an odorant, triggers the cell to send an electrical signal to the brain.

ECONOMIST: The Nobel prizes