のうち部分、のうち～部分：of

Translate: 排気管のうち、基板を貫通している部分は放熱部材として機能する。

ChatGPT:

ChatGPT

"The portion of the exhaust pipe that passes through the substrate functions as a heat dissipation member."

あなた:

How about "Of the exhaust pipe, the portion that passes through the substrate functions as a heat dissipation member."

ChatGPT:

ChatGPT

Your suggested translation, "Of the exhaust pipe, the portion that passes through the substrate functions as a heat dissipation member," is also accurate and maintains the original structure more closely.

Using "Of the exhaust pipe" at the beginning makes it clear that we’re specifically talking about a subset of the exhaust pipe, which could add clarity in complex technical documents. However, it’s slightly less streamlined than starting directly with "The portion of the exhaust pipe."

Both versions are correct, so the choice depends on whether you prefer to closely follow the Japanese structure or prioritize brevity:

1. "Of the exhaust pipe, the portion that passes through the substrate functions as a heat dissipation member." (follows original structure)
2. "The portion of the exhaust pipe that passes through the substrate functions as a heat dissipation member." (more streamlined)

Both are strong options depending on the context.