tan·gen·cy /ˈtænʤən(t)si/
接觸
Tan·gen·cy n. The quality or state of being tangent; a contact or touching.
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tangency
n 1: the state of being tangent; having contact at a single point
or along a line without crossing
2: (electronics) a junction where things (as two electrical
conductors) touch or are in physical contact; "they forget
to solder the contacts" [syn: contact]