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In the case of the ambulance and police car, it's more a question of brightness.
警车和救护车上之所以用红灯，大多是因为红灯亮度大。
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$firstVoiceSent
- 来自原声例句
In the case of the ambulance and police car, it's more a question of brightness.
警车和救护车上之所以用红灯，大多是因为红灯亮度大。
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