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1.The hospital has installed smoke-prevention stairwells in all its buildings to help patients and visitors avoid secondhand smoke.
医院在其所有建筑中安装了预防吸烟楼梯间，以帮助患者和访客避免二手烟。
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2. The new law requires all public buildings to have smoke-prevention stairwells, which helps protect the health of everyone who uses them.
新法律要求所有公共建筑都设有预防吸烟楼梯间，这有助于保护使用它们的所有人的健康。
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3. Many people choose to smoke in their homes instead of going outside, but having a smoke-prevention stairwell can make a big difference in their lives.
许多人选择在家中吸烟而不是外出，但拥有一个预防吸烟楼梯间对他们的生活会有很大的不同。