a.

1. 密封的
2. 鍊金術的
3. 神祕的；深奧的，不易理解的

adj.

1. (of a seal or closure) complete and airtight.
2. insulated or protected from outside influences.
3. (also Hermetic) of or denoting an ancient occult tradition encompassing alchemy, astrology, and theosophy.
   ▸esoteric; cryptic.