The computed movement is then restricted to the maximum distance from the center of the zoom slider.

计算得到的移动将被限制在从zoom滑块的中心位置移动的最大距离。

youdao

There's also a power button, shutter release, and zoom slider up top — all pretty standard stuff.

顶部上有一个电源按键，快门按键，镜头远近调焦键。

youdao

As for buttons, there is a shutter release, a slider for an 8x optical zoom and a power button.

机身按钮包括一个快门键、一个8倍光学变焦滑钮和一个电源键。

youdao

So is a touch slider built into the surface for controlling the zoom.

WSJ: Lytro Takes Fresh View on Picture Taking

There's a reason, of course -- the current e-ink technology is simply not built for web browsing -- the page refreshes a lot during scrolling, images don't look great and in the case of the Kobo, there's no pinch-to-zoom, so you've got to rely on an ever-present slider on the bottom to make things larger.

ENGADGET: Kobo Glo review: another illuminated e-reader lights up the market