The NTSB says the wing of that seaplane that crashed off Miami had cracks in the main support beam that probably went unseen for a long time.
英
美
- 安全运输委员会说；在迈阿密坠毁的水上飞机的机翼在主要支撑梁处有断裂；这种情况已经很久都没有发生过了.
