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。
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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