词汇	自由节律
释义	自由节律医free run
随便看	direction constancy direction constraint graph direction contrast direction control Direction Control Aid direction control circuit direction control damper direction controller direction controlling direction control switch direction control system direction control systemguidance system direction control valve direction converter direction convex function direction-correlating direction correlation direction cosine direction cosine algorithm direction cosine matrix direction-cosine matrix direction cosine plane direction cosines direction course direction cross positioning