How do you translate just one line with Google Translate's camera?
Imagine standing in front of a museum notice, trying to work out which sentence tells you where to leave a coat. You don't need every paragraph translated across the camera view. You need time to read that one instruction. Google's existing Android guide describes a narrower route: open Translate, choose the languages, tap Camera and use the shutter button. Tap Expand to see the translation options. You can turn on Show original text, tap a word and drag the selection handles over the passage you want. Its translation appears in a card; drag the card up if the text is too long. I'd use that captured view before passing the phone to the person beside me. They can read the same selected sentence without either of us having to keep the camera aimed at the wall. That's a suggested use, not a device test I've run. Google warns that small, unclear or stylized text may translate inaccurately, so a readable card isn't proof the wording is right. I like having a way to stop scanning and start reading. A camera shortcut is much less useful if holding the phone steady becomes the whole task.
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Before relying on this abroad, try one ordinary sign with Wi-Fi and mobile data switched off. Google's Android guide says camera translation works offline after the relevant languages finish downloading; the download button alone isn't the check. Can you capture the sign, select the passage and read the result without reconnecting? That's a short test I'd suggest before leaving, not one I've run. It checks whether the tool is available when you need it, not whether its translation is correct. Finding out at home is cheaper than spending part of a museum visit hunting for a signal.