Last summer's joint American-Iraqi operation, codenamed "Together Forward", was followed by the most vicious round of killing yet seen in the city.

去年夏天美伊发动了代号为“携手并进(Toge ther Forward)”的联合行动，接着就是到目前为止该城市所见的、最为凶恶的一轮杀戮。

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Go round and begin again, resulting in vicious spiral.

周而复始，造成恶性循环。

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Chelsea were first to show when, after Everton right-back Tony Hibbert was caught napping in the fourth minute, Ashley Cole's vicious high volley forced Tim Howard to dive high and push round his post.

BBC: Everton 0-0 Chelsea

Right now, our economy is trapped in a vicious cycle: The turmoil on Wall Street means a new round of belt-tightening for families and businesses on Main Street--and as folks produce less and consume less, that just deepens the problems in our financial markets.

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And Davis called a halt to the contest when another vicious combination forced the referee to intervene with only nine seconds of the round remaining.

BBC: Harrison retains titles