Careful in the use of material resources
An economical method of evaporation must be found.
The system is economical in fuel, but needs skilled attendance to keep the appliances and fittings in order.
Turrettini did much to increase the economical prosperity of the city.
by building out, which is economical and sometimes necessary.
It is more economical Lowerin g to save the men's strength, however, by raising men.
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