Englishfor English speakers
downtime
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noun
a period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions)
density
Noun
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Density is how much stuff fits in a particular area.
The population density of Singapore is one of the highest in the world.
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The density of a material is how closely packed its atoms are.
The density of water is higher than the density of steam.