尽管许多父母认为，给做完家务的孩子零花钱对他们有好处，但是许多专家担心，将做家务和零花钱紧密联系起来并不合适。

Although many parents believe that paying an allowance for completing chores benefits their children, a range of experts expressed concern that tying allowance very closely to chores may not be ideal.

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我想这说明用户的参与和项目必要性之间有很紧密的联系。

I think this demonstrates the correlation between user involvement and project necessity.

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身体健康和幸福感有非常紧密的联系。

There's a strong tie between physical health and happiness.

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