【化】 environmental corrosion
about; all around; around; round; round about
【医】 amphi-; peri-; periphery
medium
【计】 M
【化】 medium
【医】 excitatory transmitter; media; mediator; medium; neurogen; transmitter
【化】 contact corrosion; crevice corrosion; environmental corrosion
galvanic corrosion