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Control only needs to flow once from a source element to a target element.
从源元素到目标元素，控制只需要流动一次。
youdao
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Drink the flow with a source, read my teacher when you learn it.
饮其流者怀其源，学其成时念吾师。
youdao
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Drink the flow with a source, read my teacher when you learn it.
饮其流者怀其源，学其成时念吾师。
youdao