ChatGPT:
Here are clean patent-style options:
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The length of Region A in the longitudinal direction is greater than the length of Region B in the longitudinal direction.
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The longitudinal length of Region A is greater than that of Region B.
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Region A is longer than Region B in the longitudinal direction.
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(using “front-rear”) The length of Region A in the front-rear direction is longer than the length of Region B in the front-rear direction.
Notes: 前後方向 → longitudinal direction (standard in diaper/spec patents). “Greater” or “longer” are both acceptable; Option 1 is the most explicit/claim-safe.
あなた:
ChatGPT:
Short answer: it’s grammatical but clunky. In technical/patent style, compare quantities with greater than/exceeds, and compare objects with longer.
Better choices:
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The longitudinal length of Region A is greater than that of Region B.
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The length of Region A in the longitudinal direction exceeds the length of Region B.
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Region A is longer than Region B in the longitudinal direction.
Avoid:
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“the length … is longer than the length of …” (not wrong, just redundant)
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“Region A is longer than the length of Region B” (mismatched types)