在人工降雨场正式试验，一次获得成功。
It has been successful in the artificial rainfall testing fields.
分别在正式试验开始后的第15、3 0天，取样化验测定蛋中锌、硒的含量。
Both zinc and selenium in eggs were assayed on days 15 and 30 after the experiment started.
这些因素包括进一步开展大规模试验的需要，数个国家对该产品的正式批准，和其普通的现成喷雾液类型相对较短的货架寿命。
These include a need for further large-scale trials, official approval of the product in several countries, and a relatively short shelf-life in its normal ready-to-spray liquid form.
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