My wife and I took a trip to Japan about a year ago. Though many of the people we met spoke at least some English, conversations were sometimes challenging. At the time, I used my iPhone to translate between English and Japanese. But the next time we visit another country, I'll be able to use Apple's Translate app directly from my Apple Watch.
Added to the watch with WatchOS 11, the Translate app prompts you to choose your two languages, speak, and then listen to the translation. You can modify the speed of the playback to make it faster or slower. Plus, you can download as many as 20 different languages, so the translations will work without an internet connection.
Normally, the Translate app handles the translations online. But you may run into spots with weak or no internet access. In that case, you'll want to download a language ahead of time so you can use it offline.
Before running the downloads, ensure you're on a Wi-Fi network with a good connection. Then tap the option for Downloaded Languages. On the next screen, choose each language you wish to download. The app supports Arabic, Chinese Mandarin, Dutch, English, French, German, Indonesian, Italian, Korean, Polish, Portuguese, Russian, Spanish, Thai, Turkish, Ukrainian, and Vietnamese.
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Back at the previous screen, you can turn on the switch for On-Device Mode if you want the translations to work offline with the downloaded languages. However, this prevents you from using any languages you haven't downloaded.
No app is perfect, and that includes the Translate app. But there are ways to make it more effective and reliable.