The situation in the field is fluid and sometimes requirements change suddenly and this means stock already purchased may not be used within a reasonable timespan.
应急产品本身意味着你希望它们永远不要派上用场。
The nature of emergency products means that you hope they never have to actually be used.
事实上,在14世纪保加利亚的一系列政治谋杀中,这种戒指可能都派上了用场。
In fact, in a series of political murders in Bulgaria in the 14th century, such rings may have come in handy.
Couches come in handy for naps, as first-quarter freshman tackle an especially rigorous schedule: high-level physics and math, accelerated chemistry, and computer science.
The Office of Naval Intelligence was established in 1882 for'the purpose of collecting and recording naval information' that could be useful in war and peace.
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