| 彻 | chè dǐ | thorough / thoroughly / complete | 
| 彻 | chè | thorough / penetrating / to pervade / to pass through | 
| 底 | de | (equivalent to 的 as possessive particle) | 
| 底 | dǐ | bottom; base / background; foundation / copy (of a manuscript or receipt etc) kept as a record / (suffix) end of a year or month / (math.) radix; base (abbr. for 底数) |