efficient
/ɪˈfɪʃənt/
being effective without wasting time or effort or expense
Chinese meaning: 高效的；有效率的
The new engine is more fuel-efficient than the old model.
新发动机比旧型号更省油。
An efficient public transport system can reduce car usage.
高效的公共交通系统可以减少汽车使用。