(pos:名詞)<explanation>yue:事情、他人嘅深層、不為人知嘅部分eng:unknown background<eg>yue:我唔清楚佢嘅底藴，你最好小心啲。 (ngo5 m4 cing1 co2 keoi5 ge3 dai2 wan5, nei5 zeoi3 hou2 siu2 sam1 di1.)eng:I don't know everything about him. Be careful.