Rain could put a real damper on events. Beijing's National Stadium was built without a roof.

对奥运开幕式而言，降雨可能会很扫兴；而且北京的国家体育场是没有屋顶的。

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The smelter, owned by Met-Mex Peñoles, part of a big Mexican mining group, ran without a roof from 1901 until 2000, blanketing the surrounding area with layers of fine black powder.

这家冶炼厂归Met-Mex Peñoles所有，它是一个大的墨西哥矿业集团的一部分，1901年建厂时它连厂房屋顶都没有，到2000年该厂把周围的地区盖上了一层层细的黑色粉末。

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"A poor father and a poorer son, without food and with no roof to cover them," answered the Marionette.

“一个可怜的父亲，一个更可怜的儿子，没有吃的，没有房子住。”木偶回答说。

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Government statistics put the number of people without a roof over their heads in London at 267.

BBC: NEWS | UK | England | London | Differences over homeless figures

Ivan is sending its outer bands to us and with all the major damages from Frances, the thousands of homes without a roof will now suffer much more damage from water.

BBC: NEWS | Have Your Say | Hurricane Ivan: Your experiences

The reason for this is that since 2000, the International Association of Athletics Federations (IAAF) has ruled that world records can be set in a facility "with or without a roof".

BBC: When is a record not a record?