单词	图书交换
释义	图书交换Book Exchange
随便看	angle of nip angle of obliguity angle of obliquity angle of observation angle of optical rotation angle of optic axes angle of orientation angle of oscillation angle of osculation angle of outlet angle of overlap angle of parallax angle of parallelism angle of phase difference angle of phase lag angle of phase lead angle of photographic coverage angle of pitch angle of pitching angle of pitch; pitching angle angle of polar are angle of polarization angle of position angle of pressure angle of projection