前反叛份子先前的推进在星期六节节败退，效忠卡扎菲人员守住了城内的高地，用火箭和迫击炮轮番攻击对手。
An advance by former rebels was pushed back Saturday and Gadhafi loyalists continue to hold the high ground inside the city, pounding their opponents with rockets and mortars.
但对于乙型肝炎病毒，研究人员对病毒攻击时免疫系统的轮番处理机制的免疫相关过程知之甚少。
But for HBV, researchers know relatively little of the immune processes that get into gear when the virus strikes.
每个机组都驾驶飞机轮番而上，每个机组的指挥官都在第一时间尽全力攻击目标。
Each task group had launched its aircraft without waiting its turn. Each strike leader was trying to be the first to hit the target.
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