Optional conversion between the control depending on the hardness of the material;

根据不同的材料可选择硬度间的转换对照；

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Set audio playback of 8-bit and 16-bit audio, mono stereo or 5.1 surround sound, with optional conversion if the format is not supported by the hardware.

支持8位、16位，单声道、立体声或5.1环绕声的播放，同时在硬件不支持特定格式时提供可选的转换。

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Standard configuration is sidle frequency conversion motor drive & dec optional configuration is servo motor drive.

标准配置横行变频马达驱动，可选购横行伺服马达驱动。

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Many makers sell optional conversion kits costing as much as a couple hundred dollars, which turn the crib into a toddler bed, often partially surrounded by rails and low enough to get in and out of without help.

WSJ: Manufacturers Discuss Safety Features of the 'Modern' Crib

"Gas becomes optional, " with this conversion, Coquillette said.

CNN: Hybrids trick out, plug in