Concerns have been raised over the damage caused to children's backs by heavy bags.

过重书包对学童背部的伤害引人关注。

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They raised their guns and aimed at the enemies' backs.

他们端起枪，瞄准了敌人的后背。

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They raised their guns and aimed at the enemies' backs.

他们端起枪，瞄准了敌人的后背。

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