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Answer variants:
a thing that interferes or slow down the progress of something
a problem or difficulty that you have to deal with to gain success
a period of time that makes you to wait due to a problem that makes your work late
to experience a difficulty or danger
1. encounter \(=\)
2. hindrance \(=\)
3. delay \(=\)
4. hurdle/obstacle \(=\)
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