very strong and resilient
muy fuerte y resistente (moi fuerte y resistente)
"She is tough as nails, nothing can break her spirit."
"Ella es tough as nails, nada puede romper su espíritu." (Ella es **tough as nails**, nada puede romper su espiritu.)
past one's prime; no longer young or at peak performance
to express oneself in a way that is easy to understand
to be afraid of things you don’t understand or haven’t exper...
A method of data analysis that automates analytical model bu...
to achieve something very difficult
to watch someone carefully because you don’t trust them comp...