在压刀板的其中的一边两侧各有一个导向爪，另一边无导向爪。
Both sides of one edge of the scalpel pressing plate are respectively provided with guide pawls, and the other edge of the scalpel pressing plate has no guide pawls.
玛莎小姐迅速地在两条面包上分别深深地切了一刀，慷慨地加进了好多黄油，然后再把面包压实。
With a bread knife Miss Martha quickly made a deep slash in each of the stale loaves, inserted a generous quantity of butter, and pressed the loaves tight again.
我要下降时，就用一把刀捅破一些气球，或者割掉绳子放飞它们。要上升时，就扔掉一部分用来压重的水。
I descended by popping balloons with a knife or cutting them free, and climbed by throwing off some of my ballast water.
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