Sunglasses are essential. Not just a fashion accessory, sunglasses protect your eyes from UV radiation, a cause of cataracts.

必备太阳眼镜。太阳眼镜不只是一个时尚配件，它能保护你的眼镜免受太阳辐射患上白内障。

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The pressure oscillation in piping system can lower the efficiency of the pump, cause the additional consume of energy and emit noise, deteriorate the working condition of the accessory.

管道系统中的压力脉动会对管道系统中造成许多危害，例如它会降低泵的工作效率、增加额外的能耗、产生噪声，使管道附件的工况变坏和造成管道振动等等。

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The premise of accessory is the objective existence of the principal, but the cause of preventive of the principal doesn't apply to accessory.

从犯的成立以主犯的存在为前提，但主犯的责任阻却事由不及于从犯。

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