NW-SE wavetrain runs from Ural to mid Asia and then to East Asia and the low-frequency vortices of Ural origin travel southward and then eastward, leading to the change in phase of the wavetrain.

从乌拉尔经中亚到东亚存在一个西北一东南向的波列，源自乌拉尔地区的低频涡旋先是向南然后向东移动导致波列位相的转变。

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Under the hood, PLAYBAR gets its punch from nine individually amplified speakers: six mid-woofers to deliver deep, rich low-frequency sounds, and three tweeters for crystal clear high-frequency detail.

ENGADGET: Sonos Playbar: a home theater soundbar that wirelessly streams music for $699, we go hands- (and ears) on