炭素 たんそ いち よん ほうではありませんでした
tansojū yonhōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 炭素14法

1. Was not carbon-14 dating.; Was not the carbon-14 method.

Past/Perfective
Negative
Polite
Formal Register