秘诀
mì jué · HSK 7
secret know-how
🤫🔑 秘 secret + 诀 knack = the secret knack behind a winning recipe
秘 means secret or hidden, and 诀 means a knack or rhymed mnemonic formula. Put them together and 秘诀 is the hidden trick or know-how that makes something work, like the recipe for success or the key to long life.