从景气指标的变化方向出发，从谷到峰的期间称为扩张期（Expansion），从峰到谷的期间称为收缩期（Contraction），峰到谷或谷到峰的期间称为一个阶段，而两个相同转折点之间的期间称为周期。
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目的探讨防止扩张期切口裂开的扩张器植入方法。
Objective to find an expander implanting method to prevent incision rupturing during the expanding stage.
上世纪70年代，适逢日本平稳扩张期，日元曾一度低至300日元兑1美元。
During the halcyon years of Japanese expansion in the 1970s, the yen sometimes traded as low as 300 to the dollar.
通常情况下，利润率在一轮扩张期的前两三年内上升，但在进入衰退前和衰退期间下跌。
Profit margins have generally widened during the first two-to - three years of an expansion, but they tend to collapse immediately before, and during, a recession.
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