a heavily mined river的用法和样例：
- A heavily armed foot soldier of ancient Greece.
- On the German side, the riverbanks were heavily mined from the river to the trench system that commanded the river.
- Overdraw a heavily overdrawn account.
- A heavily spiced stew of meat, vegetables, and chickpeas.
- This area was very heavily mined by both sides over long periods of the war.