Usages of la polea
La polea se desprendió; por poco y cae la plataforma.
The pulley came loose; the platform almost fell.
Bajaron el andamio de repente y solté la polea.
They lowered the scaffold suddenly and I let go of the pulley.
Elon.io is an online learning platform
We have an entire course teaching Spanish (Latin America) grammar and vocabulary.