A word element, such as a prefix or suffix, that can only occur attached to a base, stem, or root.

词缀词素，如前辍或后辍，其只能通过附加于词基、词干或词根而出现。

youdao

The stem, or base, is entered up a steep set of stairs by the side of the house and through a bright orange front door.

WSJ: Building Outside the Box

In one, a lovely long stem sprouting two leaves rises from a bronze base.

ECONOMIST: American contemporary art

These two issues are basically childhood diseases that stem form the fact that, right now, the user base is nothing compared to entire population.

FORBES: The End of Bitcoin Part II