用作定语
▲～+n.
Economical shoppers wait for auction sales.节俭的购物者等待大拍卖。
She is an economical housekeeper and feeds her family cheaply.她节约持家,一家人吃得很省。
We bought a small car for economical reason.由于经济上的原因,我们买了一辆小汽车。
用作表语
▲S+be+～
He has to be economical, because he hasn't much money.他非得节俭不可,因为他没多少钱。
▲S+be+～+prep.-phrase
This company is economical in the use of its funds.这个公司节约使用资金。
We must be economical of our natural resources.我们不能滥用自然资源。
You should be more economical of your energy.你应该多多节省你的精力。
▲S+be+～+to-v
The car is economical to run.开这辆汽车费用很省。
