Let's look at the application’s interface:
Application shows an audiobook as an audio waveform and lets you select any fragment of it for listening. But actually this isn't necessary,
because the application itself searches for phrases very well. You can also correct current selected area: press on selection edge and drag it.
As you can see in the above screenshot, the application also shows boundaries of the phrases before and after the current one.
There are three buttons for playback. You can use them depending on you level of knowledge of the foreign language and your approach to using the application: