How the word "thirteen" is translated into English
My sister is thirteen years old.
[ˈmaɪ ˈsɪstər ˈɪz ˌθɜrˈtin ˈjɪrz ˈoʊld.]
There are thirteen students in our class.
[ˈðɛr ˈɑr ˌθɜrˈtin ˈstudn̩ts ˈɪn ɑr ˈklæs.]
Is your room number thirteen?
[ˈɪz jər ˈrum ˈnəmbər ˌθɜrˈtin?]
"thirteen" is in the lesson "Numbers" (Level 3), along with 19 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.