facial contact的用法和樣例：
例句
- The line of contact is longer and the contact ratio is bigger, the meshing stationarity is good.
漸開線弧齒圓柱齒輪具有較長的齒面接觸線和較大的嚙合重合度，齒輪副嚙合平穩性好。 - A method using demodulated resonance technique based on blind source separation is developed for gear contact diagnosis.
摘要提出一種運用基於盲源分離的共振解調技術對齒輪齒面接觸故障進行診斷的方法。
