As you move onto the more expensive zoom lenses, they maintain a constant aperture.
当你继续研究比较昂贵的变焦镜头时，你会发现它们有着恒定的光圈。
If you move in the y direction, it decreases at a constant rate.
如果你在y轴的方向上移动，函数值将匀速地减少。
Two coils move the piston back and forth magnetically at a constant force.
两组线圈在一个连续电磁力的作用下来回移动一个微型活塞。
There's constant construction, roads are always getting worse, things are always on the move.
总有些建筑、道路在毁坏，事物总是变化的。
Two coils move a piston back and forth magnetically at a constant force.
两组线圈在一个连续电磁力的作用下来回移动一个微型活塞。
Two coils move a piston back and forth magnetically at a constant force.
两组线圈在一个连续电磁力的作用下来回移动一个微型活塞。
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