When the external agent has data, it may create and issue a prefetch directive.
当外部代理具有数据时，产生并发出预取指令。
2
Also this paper will have some directive function on the maintenance and utility of heating agent furnace.
对热油炉的维护、使用有一定的指导作用。
3
With plastic cup as protective cover, directive spraying of roundup water agent is safe for seedlings, of better weeding effect, and to save time and money.