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01
um, uma
used when we want to talk about a person or thing for the first time or when other people may not know who or what they are
Exemplos
They were excited to see a shooting star in the sky.
Eles ficaram animados ao ver uma estrela cadente no céu.
1.1
um, uma
used before a noun when we are not talking about a specific person or thing
Exemplos
They are going on a trip next week.
Eles vão fazer uma viagem na próxima semana.
02
um, uma
used to show someone or something belongs to a group or type
Exemplos
The rose is a flower with beautiful petals.
A rosa é uma flor com pétalas bonitas.
01
a nota lá, o lá
the musical pitch A, which is a specific note in the diatonic scale commonly used in Western music
02
ångström, unidade de comprimento igual a um décimo de bilionésimo de um metro
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
03
um, o grupo sanguíneo A
the blood group whose red cells carry the A antigen
04
a primeira letra do alfabeto romano, a letra A
the 1st letter of the Roman alphabet
05
adenina, um dos quatro nucleotídeos usados na construção do DNA
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
06
adenina, base púrica encontrada no DNA e RNA
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
