What is the meaning for this sentance "Please cut the lines in glass with a wet saw going slowly back & forth until it is approx 1/8''d. They will then need to mask off glass and frost edges of cut glass to smooth out."

大概意思是: 请用一把湿锯沿线切割玻璃, 先后再前慢慢滑动锯片直至在玻璃上切入大约1/8寸深. 然后他们要拿掉玻璃,并打磨玻璃切边使之平滑。 (仅作参考)

very good

thanks very much, and I am just confused by "to mask off glass and frost edages of cut glass to smooth out"; I found the english is so difficult that I have no confidence to learn it.

mask off 在这里指遮住，盖住。 frost 在这里是指粗糙的, 未抛光的。