This is especially important when had weather makes a flight rough and bumpy, when a plane is late, or when there is an emergency.
如果碰到坏天气，飞机上下颠簸，或飞行误点，或出现紧急情况，这种镇静的情绪尤为重要。
"When I first came to Wau, there were traditional conical cottages, the dirt road was rough and bumpy, and there were very few motor vehicles and bikes," Gu recalled.
谷金凯指着哨位观察孔外面的村庄告诉记者：“我第一次来瓦乌维和时，这里全是传统的圆锥形茅草屋，路也是坎坷不平的土路，很少看到机动车，连自行车都很少见。”
Foreword: the road leading to success is rough and bumpy. No matter how strong your mind is, no matter how hard you work, difficulties and challenges always come to you one after another.
引言：走向成功的道路是坎坷的，无论你的意志是多么的坚定，无论你的拼搏是多么的艰辛，困难和挑战总是一个接著一个地出现在你的面前。
Rear hitch with spring self-locking device will not come loose when being towed on rough or bumpy road surfaces. both safe and reliable;
采用挡销式后拖钩，操作方便，并具有自锁功能，在行驶时不会因跳动而发生脱钩，安全可靠；
Rear hitch with spring self-locking device will not come loose when being towed on rough or bumpy road surfaces. both safe and reliable;
采用挡销式后拖钩，操作方便，并具有自锁功能，在行驶时不会因跳动而发生脱钩，安全可靠；
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