People use thermoses for keeping water warm .(被动语态)Thermoses are used for keeping water warm ___ ___ ___.

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People use thermoses for keeping water warm .(被动语态)Thermoses are used for keeping water warm ___ ___ ___.

People use thermoses for keeping water warm .(被动语态)Thermoses are used for keeping water warm ___ ___ ___.
People use thermoses for keeping water warm .(被动语态)
Thermoses are used for keeping water warm ___ ___ ___.

People use thermoses for keeping water warm .(被动语态)Thermoses are used for keeping water warm ___ ___ ___.
by human being

by human beings

for a period