The second figure represents the pressure of the heart as it expands and fills with blood, while waiting for the next contraction.

第二个数字代表了心脏的压力，因为它的扩展和血液填充，而等待下一次收缩。

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This aspect is to reduce the pipeline pressure loss, the other is to avoid the path contraction obstacle to the mechanical cleaning pipelines.

这一方面是为了减小管线的阻力损失，另一方面是为了避免通径收缩后给机械清扫管线造成障碍。

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Pulse: Pressure wave in the arteries from contraction of the heart.

脉搏：心脏收缩造成的动脉中的压力波动。

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The contraction of the European manufacturing sector is sparking widespread worries that European economies have lost steam and it will put tough pressure on small and independent manufacturers.

FORBES: Small European Firms Face Tough Manufacturing Marketplace