有效措施
effective measures
有效的灌溉面积
effective irrigation area
有效肥力
effective fertility
有效经营
effective management
有效担保
valid guarantee
一次有效的票证
ticket valid for one use
最有效地利用资源
make the most effective use of resources
条约仍然有效。
The treaty is still valid.
更有效地贯彻执行农业发展纲要
more effectively implement the rural development program
票子在两天之内有效。
The ticket is valid for two days.
这药治咳嗽有效。
This medicine is effective at treating coughs.
这药对他很有效。
This medicine is really working for him.