使用期限不限，一次购买，终身使用。

Lifespan limitation, a purchase, lifetime use.

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宝马按固定价格采购了许多零部件，用于新车型终身使用。

Many parts and components have been purchased at fixed prices for the lifetime of the new model.

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虽然这些药物有一定效用，干扰素有很多不良反应且需要每日用药而且还需要终身使用。

While these drugs are effective, interferon has many side effects and daily antivirals require lifelong use.

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