slip·page /ˈslɪpɪʤ/
滑移,滑動,滑程
Slip·page n. The act of slipping; also, the amount of slipping.
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slippage
n 1: a decrease of transmitted power in a mechanical system
caused by slipping
2: decline from a standard level of performance or achievement
3: failing to hold or slipping out of place; "the knots allowed
no slippage"