to assay
to analyze or test a substance, typically in a laboratory setting, to determine its components or qualities
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анализировать
[глагол]
assiduous
working very hard and with careful attention to detail so that everything is done as well as possible
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усердный
[прилагательное]
signatory
a person, organization, or country that has signed a formal agreement
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подписавший
[существительное]
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