求翻译：经济周期(Business cycle)，也称商业周期、景气循环，它是指经济运行中周期性出现的经济扩张与经济紧缩交替更迭、循环往复的一种现象。是什么意思？

Economic cycle (business cycle), also known as the business cycle, the business cycle, it is a phenomenon of economic expansion and economic contraction in economic operation periodically alternated cycle.

Economic cycles (cycle Business), also known as business cycles, and economic cycle, it is the cyclical economic run in the economic expansion and economic contraction alternating cycle of change, a phenomenon.

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Economic cycle (Business cycle), also known as the business cycle, the business cycle, it refers to the cyclical occurrence of economic operation of economic change of alternating expansion and contraction and iterative phenomenon.

Economical cycle (Business cycle), also called the commercial cycle, the boom-and-bust, it is refers to the economical expansion and the economy which in the economical movement the periodicity appears reduces in turn alternates, the repeat in cycles one kind of phenomenon.