英和和英

for twins they are very unlike

the twins were indistinguishable

I don't know either twin.

being in or not

I don't know either of those twins.

not alike or similar

a person's brother or sister

tell the twins apart

The twins match each other perfectly.

identical twins are monovular

fraternal twins are biovular

a child who has no brothers or sisters

having neither kith nor kin

existing or not

We are twins.

untouched or undefiled

people can't tell the twins apart

a child who does not have brothers and sisters

the siamese twins were not considered separable

little or nothing at all

a son of your brother or sister

not just or fair

either agreement or disagreement

the birthing of more than one offspring

The twins are indistinguishable from each other.

not tense or taut

twin brothers [sisters]

lacking companions or companionship

I can't tell one twin from the other.

One can not tell which is the elder sister, and which is the younger