jī​zhì

matrix

基质 (基質) jī​zhì
matrix noun
the base substance or solvent within a chemical compound or material

This new type of composite material uses resin as the matrix.

stroma noun
the supportive framework or ground substance of a biological tissue, organ, or cell

The chloroplast stroma is the site where the dark reactions of photosynthesis occur.

Frequency

Written text
4.61 per million

Sources

Definitions
CC-CEDICT
Frequency data
BCC Corpus (BLCU)