求翻译：There is also 3D tracking, which continuously follows moving subjects within the 39 AF points, indicating the activated AF point in the viewfinder. Utilizing Nikon’s Scene Recognition System, Auto-area AF properly judges the main subject within 39 AF points and focuses on it. Therefore, no matter what the situation or composition calls for, the D7000’s autofocus system will be ready to meet your focus needs.是什么意思？

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