chuīkǒushào
ㄔㄨㄟ ㄎㄡˇ ㄕㄠˋ
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
你會吹口哨嗎？
nǐ huì chuīkǒushào ma
Can you whistle?
Keep 吹口哨 and it comes back until you know it.