- 光化: actinic; photochemical
- 层: I storey; tier; stratum
- 光化层顶: chemopause
- 光化: [化学] actinic; photochemical 光化作用 photochemical action; 光化玻璃 [光学] actinic glass; 光化产品 photoproduct; 光化层[圈] chemosphere; 光化作用 actinism; photochemical action
- 变化层: zone of transition
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