Englishfor English speakers
obstacle
Noun
—
An obstacle is something that blocks your way.
detection
—
noun
the perception that something has occurred or some state exists
early detection can often lead to a cure
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noun
(= catching)
the act of detecting something; catching sight of something
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noun
a police investigation to determine the perpetrator
detection is hard on the feet
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noun
the detection that a signal is being received