spells

n.

a psychological state induced by (or as if induced by) a magical incantation

同义词：enchantmenttrance

a time for working (after which you will be relieved by someone else)

"a spell of work"

同义词：gotourturn

a period of indeterminate length (usually short) marked by some action or condition

"a spell of good weather"

同义词：whilepiecepatch

a verbal formula believed to have magical force

"he whispered a spell as he moved his hands"

同义词：magic spellmagical spellcharm

Analyzing the length of welfare spells
Spells of Low-Frequency Oscillations and Weather Regimes in the Northern Hemisphere.
Unemployment insurance and unemployment spells
Global variations in droughts and wet spells: 1900–1995
Local Labor Markets and Welfare Spells: Do Demand Conditions Matter?
The impact of heat waves and cold spells on mortality rates in the Dutch population.
Unemployment insurance and the distribution of unemployment spells
Trends of heavy precipitation and wet and dry spells in Switzerland during the 20th century
Multidecadal trends in the duration of wet spells and associated intensity of precipitation as revealed by a very dense observationa...
High resolution daily gridded rainfall data for the Indian region: Analysis of break and active monsoon spells