At long intervals, he drew his thumb along the edge of his knife, and nodded his head with satisfaction.
每隔很长一段时间，他就用大拇指摸摸刀刃，满意地点点头。
The edge must slice his thumb because his hand flies to his mouth, and he's sucking hard, eyes wide open.
纸片一定是划到他大拇指了，他的手里刻缩了回去，嘴用力吸着大拇指，瞪大双眼。
Practice with how much pressure needs to be put on the razor or if the thumb should hold hair against the razor's edge are each part of experimenting with this type of thinning out of hair.
这种方法需要反复练习，来摸准把头发按向刀刃的大拇指需要用多大力。
From 12 feet, you'll throw a full-spin rotation. Grab the knife by the handle, as you would a hammer, but keep your thumb along the top edge for stability and to prevent over-rotation.
你得从12英尺外让刀旋转着飞出去，所以你要像握锤子一样握住刀把，并且让拇指顺着刀刃的方向以保持平衡、防止刀转过头。
I held a sharp blue edge of steel tightly between thumb and forefinger to each fist.
我每只手的拇指和食指之间都紧紧地捏着一片锋利的蓝钢刀片。
I held a sharp blue edge of steel tightly between thumb and forefinger to each fist.
我每只手的拇指和食指之间都紧紧地捏着一片锋利的蓝钢刀片。
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