交作业：

发现了那架波音 737 Max 9 在飞行中掉落的门塞的波特兰科学老师Bob Sauer认为他后院的树木可能帮助保存了证据，“树木像安全气囊一样阻止坠落，所以它没有猛烈撞击地面。”

The Porland science teacher Bob Sauer，who found the door plug that blew out of Boeing Max 9 during the flight thought his trees in his backyard might help save the data，“The trees acted like an airbag and made for a longer fall and a lower force，so the door was not damaged by the fall. ”