a fourth part的用法和样例：
- But the servant said in answer, I have here a fourth part of a shekel of silver: I will give that to the man of God, and he will give us directions about our way.
- The gallery in which the reporters sit has become a fourth estate of the realm.
- Charles is a good egg; he will always find time to make up a fourth at bridge.
- A fourth model may be tested for flutter speed.
- A fourth estate is being planned in Tuen Mun.