fric·tion·al /ˈfrɪkʃnəl, ʃənḷ/
(a.)摩擦的,由摩擦而生的
Fric·tion·al a. Relating to friction; moved by friction; produced by friction; as, frictional electricity.
Frictional gearing, wheels which transmit motion by surface friction instead of teeth. The faces are sometimes made more or less V-shaped to increase or decrease friction, as required.
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frictional
adj : pertaining to or worked or produced by friction; "frictional
electricity"; "frictional heat"; "frictional gearing"