部分原因是现有的体制负荷过重了。

Part of the problem is that the current system is overloaded.

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负荷过重，支柱坍下来。

The load is too heavy and the supports buckle.

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负荷过重的心脏，可能承担额外的压力负荷或容量负荷。

The overburdened heart may be carrying an extra pressure or volume load.

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负荷过重的心脏，可能承担额外的压力负荷或容量负荷。

The overburdened heart may be carrying an extra pressure or volume load.

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