为了描述人类，他应该保持手掌与地面成直角。
In order to describe human beings, he should keep the palm of his hand at a right angle to the floor.
笔直往下切，让刀与刀板成直角后刀刃快速下压，切到底时用刀把刚切下来的土豆片推到一边。
Cut straight down, at a right Angle to board. with a quick stroke of the knife blade. pushing the potato slice away from the potato as you hit the board.
一条线与另一条线成直角相交。
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