What does "During the week, Alex explores the city on his own." mean in English for Spanish?

In English for Spanish, "During the week, Alex explores the city on his own." means:

Durante la semana, Alex explora la ciudad por su cuenta.

Listen to "During the week, Alex explores the city on his own.": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 4, Level 2, Scene 5