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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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Select the target element or attribute that you want to assign a value to.
选择希望赋值的目标元素或属性。
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Select the target element or attribute that you want to assign a value to.
选择希望赋值的目标元素或属性。
youdao