stratum

n. 層、地層、階層

學術名詞

• 層：生命科學、統計學、電機工程、林學、動物學、電子工程
• 地層：測量學、電機工程、礦冶工程、電力工程、機械工程、土木工程
• 階層：社會學、動物學
• 地層｛單數｝：地球科學
• 地層〔單數〕：地質學
• [階]層：數學
• 層群：動物學
• 岩層：海洋地質學

英文釋義

1. one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
2. people having the same social, economic, or educational status
3. an abstract place usually conceived as having depth
4. a subpopulation divided into a stratified sampling