However, the cardiac function of the experimental system behave with a unstable nature and decrease during the perfusion course.

但离体工作心脏模型本质上是不稳定的，心功能在灌注过程中逐渐下降。

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In the course of making the transition, new or old replacement, traditional change, will grow social unstable factor.

在这转型过程中，新旧的更替、传统的变革，在一定程度上会滋长社会不稳定的因素。

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In the course of alteration, the unstable elements in supergene zone are leached out in quantity, but the stable ones are relatively enriched.

在蚀变过程中，那些在表生条件下不稳定或较不稳定的元素大量流失，而那些稳定或较稳定元素则很少流失或相对富集。

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Of course when the dollar is weak and unstable, a disharmony reveals itself among the productive that frequently retards what should be the peaceful flow of goods.

FORBES: Memo to Washington: Economic Growth Is Easy