@caro_vina @August_West_GD @RadioFreeTom @mehdirhasan Also a good reason to improve ventilation, BTW. By all means do so. But they're not substitutes necessarily. Layered and redundant safety measures is usually preferable.
@caro_vina@August_West_GD@RadioFreeTom@mehdirhasan也是改善通风的一个很好的理由，顺便说一句，一定要这样做。但它们不一定是替代品。分层和冗余的安全措施通常更可取。