intervals 测验

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• 问题 1 :
In a severe gale like this, while the ship is but a tossed shuttlecock to the blast, it is by no means uncommon to see the needles in the compasses, at intervals, go round and round.
1. intervals
2. interval
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• 问题 2 :
For this case, we prove that the noncontractible intervals are in natural correspondence with the zonogonal tilings of a zonogon.
1. intervals
2. interval
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Other Vocabulary

1. en interval
2. en intervale
3. en internals
4. en intervales
5. en internal