So we would say we have a positive phase here and a negative phase there.
我们可以说我们在这,有正相位而这有负相位。
Each phase angle , whether positive or negative, is referenced to the horizontal.
每个相角不论是正的还是负的，都是相对于水平轴来说的。
This negative pressure phase is of short duration .
负压周期的延续时间很短。
This negative pressure phase is of short duration.
负压周期的延续时间很短。
This negative pressure phase is of short duration.
负压周期的延续时间很短。
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