someone who is strong and not easily upset
alguien que es fuerte y no se altera fácilmente (alguien que es fuerte y no se altera facilmente)
"She’s a tough cookie; nothing can discourage her."
"Ella es a tough cookie; nada puede desanimarla." (Ella es **a tough cookie**; nada puede desanimarla.)
being far superior to others in a particular field.
to fight very fiercely or with great determination
to test the limits or performance of an AI system
to take responsibility for doing something important
it’s hard for older people to learn new things or change hab...
disappointed but having learned from the experience