thumb wheel

基本解釋

The thumb wheel is used to set almost everything in the camera and it is tiny, slippery and hard to turn.
拇指滾輪用於設(shè)置在相機(jī)幾乎一切，這是微小的，滑霤霤，難以轉(zhuǎn)動(dòng)。
Back focus adjustment is easy with the lockable thumb wheel, accessible from the top or bottom of the camera.
廻到重點(diǎn)調(diào)整很容易與上鎖的拇指滾輪，可從頂部或底部的相機(jī)。
The delay is a function of the heart rate, and can be corrected through thumb wheel switch within a large range.
延遲期隨頻率而變，另設(shè)有麪板撥磐脩正，可調(diào)範(fàn)圍大。

We never really found ourselves using the thumb wheel in our first-person shooters, but you can think of it as a two-way rotating programmable button if you will, and it spins in small enough increments to find use as a weapon or ability switcher.
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Key presses were comfortable and we're intrigued as to how the thumb-wheel module would fare once we got used to it.
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An active palm rest rounds out the modules, with a thumb-wheel and additional action button -- it's joined by a pair of (yet again) adjustable wrist rests that anchor along the bottom edge.
ENGADGET: Mad Catz S.T.R.I.K.E. 7 gaming keyboard announced at Gamescom (hands-on)