effective firing range的用法和样例：
例句
- At this range, the enemy is too far away for standard rounds to be effective.
这个距离远远超过了子弹的有效射程。 - Despite the good antitank defense here, the Chinese were unable to knock out a single tank because their artillerymen could not have been worse in their firing.
尽管东北军尽心准备的反坦克堑壕成功地阻挡了苏军坦克的进攻，但由于其炮兵的射击准确度过差，没有能把握住机会，在火炮有效射程内将苏军坦克击毁。
