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Tom mallertas pri matematiko.
Tom is behind everybody in mathematics.
Vi vere mallertas, ĉu ne?
You are really clumsy, aren't you!
Mi mallertas pri nombroj.
I am awkward with numbers.
Li mallertas pri ĥemio.
He is poor at chemistry.
Kial mi tiel mallertas pri mia tempuzo?
Why am I so bad at allocating my time?