jièdiànchángshù
ㄐㄧㄝˋ ㄉㄧㄢˋ ㄔㄤˊ ㄕㄨˋ
Simplified 介电常数
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 介電常數 and it comes back until you know it.