她由她的警卫们护送登上飞机后部的活动舷梯。
She was shepherded by her guards up the rear ramp of the aircraft.
它的镜片系统可以将光线聚焦到相机后部的胶片上。
It has a lens system to focus light onto the film at the back of the camera.
当我们吃东西的时候,鼻子后部的特殊感受器会检测我们食物中的空气分子。
As we eat, specialised receptors in the back of the nose detect the air molecules in our meals.
There are nine keys for my left thumb alone so I'm kind of switching between these on the back here and many others, and because of that I can go very high and I'll just demonstrate that.
我的左手拇指就要控制九个音键,通过按动后部,和其他地方的音键,我就能吹出很高的音,我现在就来演示
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