当孩子们在外面玩耍时,父母会担心他们的安全。

Parents worry about their children's safety when they play outside.

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Parents worry about their children's safety when they play outside.

safety 是名词,来自形容词 safe(安全的)加上名词后缀 -ty 构成,表示"安全的状态或性质"。

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