N a day spent in some special outdoor activity, such as nature study or sport 户外活动日
With extension and research cooperating, results of the research were publicized in news releases, field days, Tours, and grower meetings and interest rose quickly.
由于推广和研究的结合，研究结果由新闻发布会、田间考察日、参观和种植者会议广为传播并迅速引起兴趣。
The aircraft is massive—as long as a football field and as tall as 6 double decker buses and capable of continuous flying for up to 5 days.
这架飞机有足球场那么长，有6辆双层巴士那么高，最多可以持续飞行长达5天。
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