表皮
epidermal
anatomy
botany
cell
cells
cellular
chloroform
chlorophyll
chloroplast
chloroplasts
closed
closeup
diagram
endoplasmic
environment
exchange
explanation
gas exchange
green
guard
guard cells
nucleus
open
opening and closing
phloem
photosynthesis
plant
pore
respiration
schematic stomata
scheme
science
scientific
section
seed
stoma
stomata
stomatal
stomatal complex
structure
subsidiary
swollen
transpiration
vacuole
vegetable
wall
walls
xylem
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