你要花上数周的时间不时地练习练习才能掌握各种刀法技巧，但一旦学会就再也不会忘记了。
It takes several weeks of off-and-on practice to master the various knife techniques, but once learned they are never forgotten.
那个青年收进了他的筹码，赫斯渥便离开了，没忘记先在楼梯上停下来数了数剩下的现钞。
The youth raked in his chips, and Hurstwood came away, not without first stopping to count his remaining cash on the stair.
但不巧的是，我忘记了进入语音信箱的三位数密码。
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