慢性疼痛可加重或延长脑外伤病人的功能残疾。

Chronic pain can exacerbate or prolong the function disability of the patients.

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社会变革是困难的，因此有些项目难免比预期缩短或延长。

Social change is difficult, and some projects are bound to fall short or take longer than expected.

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首先，全球卫生行动无疑取得了巨大成就，挽救或延长了数以百万计生命。

First, these initiatives have unquestionably done great good. They have saved or prolonged millions of lives.

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