The brain almost always has a plan B, even when deciding which hand to use to press a button, a new study finds.

一项新的研究表明，即使是在决定使用哪只手按下按钮的问题上，大脑也几乎总有一个备用方案。

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Change the "a" values to "a" and "b", entering one at a time and clicking the Add button.

将值“ a ”更改成“ a ”和“ b ”，输入每个值后单击add按钮。

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Click on the Add a layer mask button at the bottom of the Layers Panel and select the Brush Tool (b).

点击图层面板底部的添加图层蒙版按钮，并选中画笔工具(B)。

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The pilot of the huge B-52 bomber plane pushes a button.

VOA: special.2010.07.07

On the blaster's grip are the A and B Button equivalents, which are positioned to fall under a user's middle and ring fingers.

ENGADGET: blogger-avatar

Oh, we almost forgot -- they've boosted out the keyboard in favor of a more useful D-pad and A, B, X, Y button formation -- which is, needless to say, awesome for playing awesome games.

ENGADGET: Seabright PC430 "micro PC" spurns keyboard, not coolness

The third button says Barb, B-A-R-B, delegate for Muskie.

NPR: With White House Bogged Down By Scandal, GOP Looks For Boost