Translation of yuxtaposición

for a minute I blamed the burger that I had eaten at the duty free back in Cancun, but thinking a little further I recalled eating street food the night earlier, as it was Mexican independence day.
After our system update, lessons will be saved for 30 minutes automatically, if you want to save them permanently, you need to press the 'save lesson' button. It than works the same basically.
We found an password solution to enable teachers and their students to work with your lessons. These teachers would need to enter the password of the lessons and could then continue to use them.