a war of attrition的用法和样例：
- Fighting a war of attrition is dangerous.
- "Unfortunately, it's a war of attrition," says Mr Hintz.
- A great battle broke out in this town and resultedin a war of attrition.
- The long war of attrition exhausted the strength of both countries.
- They whittled down the enemy's military and economic strength in a war of attrition.