No. 17,437 in Russian
тестом
"Тестом" is the instrumental case of "тесто," meaning "by/with dough" in English.
In a sentence
Я работаю с тестом, чтобы приготовить пирог.
I am working with the dough to prepare a pie.
In this sentence, 'тестом' refers to 'dough', and it is the object of the action 'working with'.
Мы проверим ваши знания с тестом на грамматику.
We will check your knowledge with a grammar test.
Here, 'тестом' refers to a 'test', meaning an examination or evaluation, used as a tool.
Этот лист был покрыт тестом для эксперимента.
This sheet was covered with dough for the experiment.
In this case, 'тестом' again refers to 'dough' that was applied to the sheet for experimental purposes.
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