表皮
background
biological
biology
biotechnology
botany
cell
cellular
cross
cut
detail
discovery
education
examination
exoderm
experiment
food
genetic
histological
hypodermis
laboratory
life
maize
material
membrane
micro
microbe
microbiology
micrograph
microorganism
microphotograph
microscope
microscopic
microscopy
nature
nucleus
organic
organisms
plant
preparation
research
science
scientific
scientist
section
structure
texture
tissue
vascular
zea mays