Example sentences of "[det] [noun] occur at the [noun sg] " in BNC.
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1 | This change occurred at the beginning of the Paleozoic era starting with the Cambrian period , about 570 to 700 million years ago . |
2 | Some sedimentation occurs at the chamber floor but crystal concentration increases with time . |
3 | Subsequent research has documented that this effect occurs at the B- and T-cell levels . |
4 | Quite a surprise regarding this name occurred at the end of the last war . |
5 | In the most colonial species this chase is omitted and all courtship occurs at the nest . |