pen·e·tra·lia /ˌpɛnəˈtreliə/
密室,密事
Pen·e·tra·li·a n. pl.
1. The recesses, or innermost parts, of any thing or place, especially of a temple or palace.
2. Hidden things or secrets; privacy; sanctuary; as, the sacred penetralia of the home.
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penetralia
n : the innermost parts
[also: penetralium (pl)]