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An auxiliary steam valve is provided by which additional steam nozzles can be brought (or put) into use when required.

A failure of a hydraulic system for lowering the gear might call into play a substitute electrical system for lowering it.

The station will be commissioned [or put into operation, or brought into (or placed in) service] next year.

Источник: Русско-английский научно-технический словарь на Gufo.me