pygidial area

例句：

1. 1.The pygidial area of thehand is small, which limits its function.
   手的肢端面积小，这限制了它的功能。
2. 2. The pygidial area of the foot is larger thanthat of the hand, allowing for greatermovement.
   脚的肢端面积比手大，允许更大的移动。
3. 3. Thepygidial areaof the arm is smaller thanthat of the leg, making iteasier to lift objects.
   手臂的肢端面积比腿小，这使得举起物体更容易。