A specific part of a larger area of study or work.
In physics, there are many subfields, including quantum mechanics.
物理学には量子力学を含む多くのサブフィールドがあります。
A section of land within a larger area, used for a particular purpose.
The farmer divided his land into subfields to grow different types of crops.
農夫は作物を異なるタイプで育てるために土地をサブフィールドに分割しました。