根据Steam规范
https://support.steampowered.com/kb_article.php?ref=6627-QSNM-5276
I have moved, how do I change my store country?
If you have permanently changed your country of residence, you can set your
store country to reflect that. Go to your Account Details page and you'll
find Store Country in the right column under Your Steam Account. Once you've
selected your new country of residence, you'll need to verify it by using a
local payment method tied to a local address for your next purchase.
For example:
Say you've recently moved to the United States. You'll now see United States
as an option in the Store Country drop down. Selecting it will change your
store to display products and pricing available in the United States. To
verify your new country of residence, your next purchase will require a
payment method tied to an address within the United States.
How do I make a purchase while travelling?
Your country is now part of your Steam account, so no matter where you
travel, you'll see the store in your country's prices and be able to make
purchases as you would normally.
STEAM的规范是 当你永远移居(permanently changed)至某国家
你才可以更改你购买的商店
Travel(旅游/出差 都算) 则是用你本来的国家商店计价
当然 你人在中国的时候 可以转换到中国商店
如果你有中国的付款方式 是可以买的
但合不合乎规定 你看条文就知道了
不需要板友跟你解释
就不要好死不死发生问题时 你已经回台湾了
还是老话一句
跨区购买一定有风险
投资前请详阅公开说明书↑↑↑