xiàngliàngkōngjiān
ㄒㄧㄤˋ ㄌㄧㄤˋ ㄎㄨㄥ ㄐㄧㄢ
Simplified 向量空间
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 向量空間 and it comes back until you know it.