Archimedes worm and worm wheel
hindley worm hourglass worm
Transmission of Mul-ti-Head Worm and Worm Wheel
worm and worm wheel mechanism
Great Debate between British and North American Schools
Great Leap Forward in education
1000 m long great diameter borehole
2-D great common divisor
A Complement to the Great Collection of the Oracle
a great calligraphy master