지각 내의 암석층 또는 어떤 구조물 내의 얇은 층
A layer or a series of layers of rock in the ground, or a thin layer within any physical structure.
예문:
"The archaeologists discovered ancient pottery in the lowest stratum of the excavation site."
"Volcanic ash formed a distinct stratum that helped date the surrounding fossils."
사회적 지위, 교육, 소득 등에 따라 구분되는 사회적 계층
A level or class to which people are assigned according to their social status, education, or income.
예문:
"The new tax policy aims to reduce the financial burden on the lower economic stratum."
"Education is often seen as a primary vehicle for moving to a higher social stratum."
숲의 수관이나 하층 식생과 같이 서식지 내에서 층을 이루는 식생
A layer of vegetation in a habitat, such as the canopy or understory in a forest.
예문:
"Different species of birds occupy each stratum of the tropical rainforest."
"The herb stratum on the forest floor receives very little sunlight due to the dense canopy."
층화 추출법에서 모집단을 나누는 기준이 되는 집단
A group into which members of a population are divided in stratified sampling.
예문:
"Researchers divided the population into strata based on age before selecting participants."
"Each stratum must be represented proportionally to ensure the survey's accuracy."