同时，在养老金覆盖面扩大之前，各国可以考虑建立一种可负担的非缴费方案(零支柱)，同它来供养脆弱的老年人。

In the meantime until pension coverage expands, countries could consider creating an affordable non-contributory scheme (zero pillar) to provide for the vulnerable elderly.

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理论分析表明，煤柱塑性区宽度不仅与采深、采厚有关，而且也同采出率有关。

Theoretical analysis shows that coal pillars plastic zone width not only with mining depth, mining height, but with the recovery rate.

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可选步骤：将RNeasy旋转柱置于新的2 ml 收集管中，把旧的收集管连同其中的液体一同丢掉。

Optional: Place the RNeasy spin column in a new 2 ml collection tube (supplied), and discard the old collection tube with the flow-through.

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