All Q. V. P. bags are made with the same material on the top and bottom. This means that the woodworker can now turn the bag over once the top side begins to see excessive wear.
所有真空袋的顶部和底部采用相同材料制造，这表明真空袋顶部出现磨损时，木工可以把真空袋倒过来使用。
2
That handler simply assigns the response 'q' to the special v: swapchoice variable.