| 释义 |
pitch line
noun
Etymology: pitch (IV)
1. : the line on which the pitch of gear teeth or sprocket teeth is measured and which consists of an ideal line in a toothed gear or rack which bears such a relation to a corresponding line in another gear with which it works that the two lines will have a common velocity (as in rolling contact)
2. : the line from which players lag in the game of marbles |