存在：present, exist

車両の周囲に存在する物体を検知する物体検知装置

ChatGPT:

A natural and accurate translation of
「車両の周囲に存在する物体を検知する物体検知装置」 is:

An object detection device that detects objects present around the vehicle.

Alternatives:

1. "An object detection device for detecting objects around the vehicle."
    — More concise; common in patent and technical writing.

2. "An object detection device configured to detect objects present in the surroundings of the vehicle."
    — Slightly more formal and detailed; useful in legal or patent contexts.

あなた:

How about "objects existing"?

ChatGPT:

Using "objects existing around the vehicle" is grammatically correct but sounds a bit unnatural or overly literal in this context. In English, "existing" tends to sound philosophical or abstract when referring to physical objects—unless you're emphasizing existence in contrast to non-existence.

Comparison:

• ✅ "objects present around the vehicle" → natural, widely used in technical writing

• ✅ "objects around the vehicle" → clear and concise

• ⚠️ "objects existing around the vehicle" → grammatically fine, but awkward and less idiomatic

Revised example:

• ❌ "An object detection device that detects objects existing around the vehicle."

• ✅ "An object detection device that detects objects present around the vehicle."

• ✅ "An object detection device for detecting objects around the vehicle."

Summary:

Prefer "present" or omit altogether (just "objects around the vehicle") for a more natural and idiomatic expression. "Existing" is technically correct but sounds slightly awkward or stilted in this context.