a firm command的用法和样例：
- It was he, who in a firm commanding voice at last told Jem and Mary to be off, or they would be too late.
- I am articled to a firm of lawyers.
- We must maintain a firm attitude.
- The old man rocked and cradled Erik in his arms for a moment, and then his eyes opened and set squarely on mine.He said in a firm commanding voice," You take care of this baby.
- Phil was articled to a firm of lawyers.
- He has set up a firm of his own.