Returns the ratio of the current playback position to the total recording length.

返回当前播放位置与总记录长度的比例。

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For example, metadata about a recorded song might include information about its artist, album, composer, length, or quality, whereas the data is the audio recording itself.

例如，关于所录制的歌曲的元数据可能包括关于演唱者、专辑、作曲、长度或质量的信息，而数据则是音频记录本身。

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Raster image formats store the picture as a bitmap describing the state of pixels, as opposed to recording the length and locations of primitives such as lines and curves.

光栅图像格式将图片存储为描述像素状态的位图，而不是记录图元（譬如，线和曲线）的长度和位置。

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This is her second full-length recording.

VOA: special.2009.01.30

All of the new VIXIA HF R-series camcorders offer a higher capacity battery, nearly doubling the recording length over previous models.

ENGADGET: Canon's latest VIXIA camcorders stream and share with your mobile device

Additionally, the TL34HD utilizes H.264 compression, a codec for high definition video that has become an industry standard and which yields three times the recording length than of MPEG4.

ENGADGET: Samsung gets official with 14.7MP TL34HD point-and-shoot

Although many felt Betamax was the superior format, most cite the longer recording length of VHS tapes - three hours versus one - and the cheaper manufacturing costs for VHS machines as the main factors why VHS eventually won out.

BBC: NEWS | Technology | Q&A: Death of a format