Русско-английский научно-технический словарь
нужно
см. тж. необходимо; следует
• When the density of the gas is to be measured, ...
• To determine ... we need only perform the division of ...
• If purchased power is to be used, then only the transformers, substations and distribution facilities need be provided.
• Much needs (or remains) to be done to satisfy these requirements.
• We provide such units exactly where they are wanted.