请高手帮忙翻译一下。请不要用软件翻译。。谢谢谢谢

Dear Mr. xxx,

May I ask whether the sizes 1/2 and 7/8 you provided us is English system or metric system? Could you please send us a comparison table of your system to the metric system we are using in China.

看这里：
Hello:

   What is your size for our 1 / 2 and 7 / 8 refers to the British or American, can not give me a fat and internal metric table to me？thank you。

Hello:
What is your size for our 1 / 2 and 7 / 8 refers to the British or American, can not give me a fat and internal metric table to me, thank you.

If you leave me , please don't aost comfort me , because cach sewing has to meet stinging pain.