有效使用肥料的最佳农业做法指导方针: guidelines of best agricultural practice to optimize fertilizer use
援助: help; support; aid 短语和例子国际援助 international support; 技术援助 technical assistance; 经济援助 economic aid; 援助受难者 help the victims; 不附带条件的援助 aid with no strings attached; 援助发展中的国家 give aid to develo
