a trayful of steamed buns的用法和样例：
- A trayful of steamed bread; a trayful of steamed buns
- a trayful of steamed stuffed buns
- I sprinkled salt over the flied shoes of steamed bun.
- He came alone to the basket of steamed buns, hesitated for a second, and bent over to pick up two steamed buns of broomcorn flour.
- We feel so happy that the boss treat us! I must eat lots of steamed buns stuffed with crab roe!