usually admirable but previously unnoticed qualities of a person
内秀
solo spots reveal hidden depths.
插演（或插播）的独奏（或独唱）小节目往往会显露出不为人知的内秀。
in great detail; comprehensively and thoroughly
详细地，全面地，深入地。 参见 in-depth
research students pursue a specific aspect of a subject in depth.
研究生对课题的某一特定方面进行深入研究。
in water too deep to stand in
在深水区