The invading force was locked in fierce combat with the defenders.入侵部队与防御部队难解难分地鏖战。The three leading contenders were locked in a dogfight.三名领先的竞争者陷入一场鏖战。Whoever decides to take up the gauntlet and challenge the Prime Minister will have a tough battle.谁要是接受挑战，向首相叫板，都将经历一场鏖战。