ืืืฆืจ ืืืืื ืฉืืืคืืข ืืงืืขื ืืื ืช ืื ืงืจื ืฉื ืืืืจื ื: ืืืข, ืืืจื, ืืืกืืืจืื ืืชืจืืืช.
research
ืืืงืจ โ ืืงืืจื ืฉืืืชืืช ืฉื ื ืืฉื.
evidence
ืจืืื, ืืืืื.
hypothesis
ืืฉืขืจื โ ืจืขืืื ืฉื ืืชื ืืืืืง.
experiment
ื ืืกืื.
theory
ืชืืืจืื โ ืืกืืจ ืืืขื ืืืืืฉ.
data
ื ืชืื ืื.
result
ืชืืฆืื.
method
ืฉืืื.
approach
ืืืฉื โ ืืจื ืืืคื ืืืฉืื.
investigate
ืืืงืืจ.
discovery
ืืืืื.
phenomenon
ืชืืคืขื.
species
ืืื (ืืืืืืื).
environment
ืกืืืื.
ecosystem
ืืขืจืืช ืืงืืืืืืช.
climate
ืืงืืื.
evolve
ืืืชืคืชื (ืืืืืืฆืืื ืืช).
ancient
ืขืชืืง.
civilization
ืชืจืืืช โ ืืืจื ืืคืืชืืช.
century
ืืื (100 ืฉื ืื).
decade
ืขืฉืืจ (10 ืฉื ืื).
era
ืขืืื, ืชืงืืคื.
society
ืืืจื.
culture
ืชืจืืืช.
tradition
ืืกืืจืช.
population
ืืืืืืกืืื.
growth
ืืืืื, ืฆืืืื.
decline
ืืจืืื, ืฉืงืืขื.
increase
ืืืืื / ืืืืืื.
decrease
ืืจืืื / ืืืคืืืช.
industry
ืชืขืฉืืื.
economy
ืืืืื.
government
ืืืฉืื.
policy
ืืืื ืืืช.
law
ืืืง.
right
ืืืืช / ื ืืื.
freedom
ืืืคืฉ.
equality
ืฉืืืืื.
individual
ืคืจื, ืืืื.
community
ืงืืืื.
global
ืืืืืื, ืขืืืื.
local
ืืงืืื.
issue
ืกืืืื, ืืขืื.
concern
ืืืื / ืืืืื.
purpose
ืืืจื.