指在机器的缩放仪上做前后运动。
Refers to front to back movement of the pantograph on the machine.
我们在运动前后和运动的过程中，分别的提取他们的血液。
And before and during this exercise we were taking blood of them.
每日伸展运动，特别是锻炼前后。
用滑鼠前后移动小人，画出其运动轨迹。
Move the little man back and forth with the mouse and plot his motion.
呈直线运动，前后腿在同一平面上移动。
Moves straight with front and rear legs following in the same plane.
呈直线运动，前后腿在同一平面上移动。
Moves straight with front and rear legs following in the same plane.
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