The user is not distracted by operation-supporting elements that are currently not applicable; he or she immediately recognizes which support element to use because it is the only one being displayed.
当前不可用的操作支持元素不会转移用户的注意力；用户可以立即识别出哪一个支持元素可以使用(因为支持元素是唯一显示的元素)。
The user is not distracted by operation-supporting elements that are currently not applicable; he or she immediately recognizes which support element to use because it is the only one being displayed.
当前不可用的操作支持元素不会转移用户的注意力；用户可以立即识别出哪一个支持元素可以使用(因为支持元素是唯一显示的元素)。
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