There's some friction but it's not perfect friction,

摩擦力是存在的但不是理想摩擦力
it slips.

其间还有滑动存在
Viscosity is a measure of how slippy the fluid is;

粘度就是衡量液体有多顺滑
different layers of fluid, how easily they slide by one another

当受到剪切力时液体不同层面之间
when they're sheared.

相对滑动难易程度如何
Water, because it has a low viscosity, compared to molasses,

由于水较糖浆来说是个低粘度系数的物体
those layers of water are going to move easily over one another,

水的各个层面之间相对滑动较为容易
whereas in molasses, there's more friction

而在糖浆中由于层与层之间的
between the layers and so it's harder to move.

摩擦力更大因此较难移动
In either case, what will happen is that

无论是水还是糖浆当我施以外力时
when I apply the force, the packets of fluid up near the top

贴近顶板的那部分液体
are going to move along with the top plate,

会随着顶板一起移动