形容詞 economical:

1. using the minimum of time or resources necessary for effectiveness
   同義詞：economic
2. of or relating to an economy, the system of production and management of material wealth
   同義詞：economic
3. avoiding waste
   同義詞：frugal, scotch, sparing, stinting

1. When we had done the costings on the project, it was clear it would not be economical to go ahead with it.
   我們計算了成本，清楚表明這項(xiàng)工程不合算。
2. A monthly is more economical than 4 weeklies.
   一張月票比四張周票上算。
3. With the rapid economical development, China's position on the international stage is getting more and more important.
   隨著經(jīng)濟(jì)迅速發(fā)展，中國在國際舞臺上的地位變得愈來愈重要了。
4. The explosion of oil prices caused an economical crisis.
   石油價格的急劇上漲引起了經(jīng)濟(jì)危機(jī)。
5. Diesel is the more economical in fuel on a pound per horse power basis.
   以一磅對一馬力的比率而言，柴油式在燃料上是比較經(jīng)濟(jì)的。
6. She writes novels with economical style.
   她以簡練的風(fēng)格寫小說。
7. This is not an economical method of heating.
   這不是一種經(jīng)濟(jì)的取暖方式。
8. She is economical in her use of salt when cooking.
   她烹飪時用鹽很少。

ec.o.nom.i.cal

adj.（形容詞）
Prudent and thrifty in management; not wasteful or extravagant.See Synonyms at sparing
節(jié)儉的，節(jié)制的：管理上勤儉節(jié)約的；不浪費(fèi)或不揮霍的參見 sparing
Intended to save money, as by efficient operation or elimination of unnecessary features; economic:
節(jié)約的，儉省的：通過高效率的運(yùn)作和削減不必要的性能來節(jié)省費(fèi)用的；節(jié)約的：
例句：
a modern, economical heating system; an economical approach to control of corporate growth.
新型節(jié)能供暖系統(tǒng)；控制公司發(fā)展的經(jīng)濟(jì)手段

【引伸】
ec.onom.ically
adv.（副詞）