chādòngchǐlún
ㄔㄚ ㄉㄨㄥˋ ㄔˇ ㄌㄨㄣˊ
Simplified 差动齿轮
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 差動齒輪 and it comes back until you know it.