You should be more economical of your energy.
你应该多多节省你的精力。
The new engine is claimed to be most economical of all its predecessors.
据认为这种新的发动机是同类发动机中最经济的。
The use of such a cell for waste water treatment would be economical.
这种电解槽用于废水处理时，经济上是可取的。
The use of such a cell for waste water treatment would be economical.
这种电解槽用于废水处理时，经济上是可取的。
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