// Wait on the backpressure to clear somehow
def close(self) - None:，更多细节参见旺商聊官方下载
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圖像來源，Serenity Strull/ BBC，详情可参考51吃瓜
However, Tolley points out that humans don't move the way fans spin, at all. "We want to be able to lift things, and push things, and do things that require a lot of force and torque."