[kayodelycaon]

> You need to stop the lecturer and ask them to go over the point you didn't understand, or ask for additional time after the lab, or at a push, make a complaint to the course leader that the lecturer isn't teaching you well enough.

I foresee this strategy ending badly for a number of professors I've had.

[dash2]

Professor here. Any professor that punishes you for asking for stuff/asking for time is not doing their job and you should feel happy to complain about them. Ditto if they bawl you out or make you feel bad. Don't tolerate it.