Pesquise entre vários professores de Inglês...
Vocabulary based on this video: https://www.youtube.com/watch?v=5EsICTVo2dM&ab_channel=TED-Ed
Questão 1 de 9
What does 'mainstay' mean?
A temporary or unimportant part of something.
A thing that is the most important or fundamental part of something.