飞行高度达20km，以至于使用不透明的淡黄色轩窗过滤太阳射线保护乘客(我在想中间这个舱门怎么进去呀)。
Opaque yellowish Windows protected passengers from the solar radiation as the plane flew at the height of 20 km.
加拿大香脂：从香脂冷杉中获取的一种有粘性的、淡黄色的透明树脂，用作玻璃透镜的胶合剂或将标本粘贴在显微薄片上。
Canada balsam: a viscous, yellowish, transparent resin obtained from the balsam fir and used as a cement for glass lenses and for mounting specimens on microscopic slides.
加拿大香脂：从香脂冷杉中获取的一种有粘性的，淡黄色的透明树脂，用作玻璃透镜的胶合剂或将标本粘贴在显微薄片上。
Canada balsam: a viscous yellowish transparent resin obtained from the balsam fir and used as a cement for glass lenses and for mounting specimens on microscopic slides.
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