The expenditure of something, such as time or labor, necessary for the.
成本某物的花费，例如时间或劳动，是为达到某一目的而必需的。
Therefore, close observation of the fetal heart rate tracing is necessary during labor.
因此产程中应严密观察胎心变化。
Therefore, close observation of the fetal heart rate tracing is necessary during labor.
因此产程中应严密观察胎心变化。
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