... 单线纲目屏 single line screen 单线河 single line stream 单像测图仪 single model instrument ...
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This is single arm drill elementary starting up with a good stream line position. left arm moving? And you notice Lindsay keeps a good line looking at the bottom of the pool.
这是基本单臂划水训练，起始时就有很好的流线形。左臂移动？，保持好的流线，注视池底。
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