@RadCentrism I think (1) is probably enough to get close to full elimination. (2) might be helpful to achieve (1) in practice and (3) helpful to address situations (e.g. old buildings, hard or impossible to retrofit) where (1) isn't achievable.
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@RadCentrism 我认为（1）可能足以接近完全消除。 (2) 可能有助于在实践中实现 (1)，并且 (3) 有助于解决无法实现 (1) 的情况（例如，旧建筑、难以或不可能进行改造）。
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