软实时系统超过截止期限后并不会造成系统整体失败(如丢失视频中的一帧)。
Soft real-time systems can miss deadlines without the overall system failing (such as losing a frame of video).
第一帧：蹬壁后保持从耳边稍微分开的流线型。头向下面朝池底。在这一帧中，脚几乎不打水。
Pushes off wall with streamline slightly separated from ears. Head is down facing floor of pool. Little to no flutter kick is occurring during this frame.
为了提高效率，在定位出前一帧的眼睛位置后，我们只在估计的范围内搜索下一帧眼睛的可能位置。
In order to improve efficiency, eye location of the next fame is predicted according to previous ones.
为了提高效率，在定位出前一帧的眼睛位置后，我们只在估计的范围内搜索下一帧眼睛的可能位置。
In order to improve efficiency, eye location of the next fame is predicted according to previous ones.
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