translation.en: So this technology, 3D printing, and new design rules really help us to reduce the weight, which is the biggest issue in aircraft design, because it's directly linked to greenhouse gas emissions.
translation.zh: 所以这技术、 3D 印刷和新的设计规则 真正帮助我们减轻重量， 这是飞机设计中最大的问题， 因为它与温室气体排放量直接相关。