Tire inflation pressure retention (IPR), as measured by percent air loss per month, is a key parameter to improved performance and passenger safety.
用月气压下降率量度的轮胎气压保持率（IPR）是改善轮胎使用性能和保障乘客安全的一个关键参数。
Pressure relief valve to prevent over inflation of the air bag.
泄压阀可以避免气囊过分膨胀。
When the air pressure of the inner tube rises to a rated value, the one-way valve is closed, and the inflation process is completed.
内胎气压升高到额定值时，单向阀关闭，充气过程即结束。
When the air pressure of the inner tube rises to a rated value, the one-way valve is closed, and the inflation process is completed.
内胎气压升高到额定值时，单向阀关闭，充气过程即结束。
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