One big cost, at least for some designs, is the sorbentmaterial, which cannot be recycled indefinitely.
对某些方案来说,一个巨大的花费来自于不能循环利用的吸收剂。
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Several designs are being developed, but they involve variations on the same theme. In each case air is brought into contact with a “sorbent” material, which binds chemically with the carbon dioxide.