The lower stalks of the steering wheel have two extra buttons.
方向盘下面有两个额外的按钮。
Now we have two buttons that grow in ratios of 2:3 and 1:3 of extra horizontal space.
现在我们有两个按钮，两者之间的大小比例为2：3，额外水平空间比例为1：3。
Their input capabilities are limited to a few buttons or numbers, or entering data takes extra time, as happens with a personal digital assistant's (PDA) handwriting-recognition capabilities.
它们的输入功能局限于几个按键或数字键，或者像个人数字助理（PDA）手写体识别功能那样，输入数据要花很长时间，它们所拥有的工作处理能力和内存都较小。
Their input capabilities are limited to a few buttons or numbers, or entering data takes extra time, as happens with a personal digital assistant's (PDA) handwriting-recognition capabilities.
它们的输入功能局限于几个按键或数字键，或者像个人数字助理（PDA）手写体识别功能那样，输入数据要花很长时间，它们所拥有的工作处理能力和内存都较小。
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