practical
practicable是“可以实行的”，practical是“实际上的”、“实用的”或“有实际经验的”。
注意下面两句里的practical和practicable：
- Of all the plans devised by certain practical men with practical knowledge, only one proved to be practicable.
- Practical minds are engaged in trying to invent a practicable method of producing something of practical value.
