about to burst forth的用法和样例：
- To burst forth into or as if into flame.
- He looked as if he was about to burst into tears.
- The buttons on his ragged shirt and coat were about to burst.
- By bringing jealousy into play,he had caused the truth to burst forth in wrath,he had educed the justice of revenge.
- You are about to burst into tears at any moment and you don't know why.