求翻译：Nowhere was it more strenuous than at the back, where Hamburg leaked 52 goals, more than all but five other teams in the top flight. On top of that, when it came to conceding on the break after losing possession, HSV were in a class of their own. "Preventing the other side scoring requires a collective effort, from the whole team. Just chalking that up against the defence is too simplistic. The fact is, we let in too many goals", said left back Marcell Jansen.是什么意思？

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