become easier to access Example: In the last 20 years China has
opened up to international trade. For more meanings of the
phrasal verb open up , follow the link. To go on to something is
to progress. Example: He went on to university and then became a
teacher. A stepping stone is a stage of achievement or an event
that leads on to something else. Example: Doing a postgraduate
honours year is a stepping stone to a PhD. et cetera; and so on;
other things like that Example: I like driving anything fast -
motorbikes, speedboats and that.