这种游标包括所有的数据，并使您能够遍历游标中的每条记录，但不能向后移动。
This cursor includes all of the data and enables you to move through each of the records in the cursor, but doesn't enable you to move backwards.
这就是为什么你的底部向后移动时，你弯腰时使你的重心仍在你的脚下。
This is why your bottom moves backwards when you bend over, so that your centre of gravity can still remain over your feet.
这就是为什么你的底部向后移动时，你弯腰时使你的重心仍在你的脚下。
This is why your bottom moves backwards when you bend over, so that your centre of gravity can still remain over your feet.
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