1·These products use the existing eye muscles to change the shape of the lens and move it backwards and forwards in the eye during focusing.
这些产品使用现有的眼睛肌肉去改变晶体的形状,在眼睛聚焦的过程中使它向前和向后移动。
2·Roll your shoulders forwards, then backwards, timing each roll with a deep breath in and out.
转动肩膀,向前,然后向后,每转动一次伴随着一次深呼吸。
3·Roll your shoulders forwards, then backwards, timing each roll with a deep breath in and out.
转动肩膀, 向前,然后向后,每转动一次伴随着一次深呼吸。
4·But unlike an aircraft, when a helicopter is flying forwards the air passing over its rotor blades does so at different speeds.
但是与飞机不同的地方在于,当直升机向前飞行时,空气是以不同的速度流过旋转的叶片的。
5·This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift.
这意味着它能像直升机一样悬停,但向前飞时可能减少主旋翼的速度并让这两个短翼提供部分提升力。