This is the piece of data that would ensure the cached results are unique and match the request, so, for example, Miami forecasts are always returned to other users asking for Miami weather.

因此这个参数确保了高速缓存返回的结果是唯一的，也是用户所请求的，例如Miami的天气预报就可以提供给其他需要它的用户。

youdao

A piece of new poem, a cup of wine; Weather of last year, pavilions of olden time.

一曲新词酒一杯，去年天气旧亭台。

youdao

Mary Academy is still a simple piece of white stone briefly carved, but as time marches on, duanwenw, . com it may be spoiled by dust, worn out by weather, or broken into separate pieces.

圣玛丽亚女校仍是一块只经过稍微雕琢的普通白石，但是随着时光的流逝，它也许会被尘埃染污，受风雨侵蚀，或破裂成片片碎石。

youdao

As screens get sharper and batteries stronger, more people will get their sitcoms and weather reports on demand, their articles on the Web rather than on a piece of paper.

FORBES: The Killer Ad Machine

It might be a while before stylists and cold-weather dandies renounce traditional layering, but more practical-minded types seem to be gravitating toward the single but versatile piece of outerwear.

WSJ: 'Transformer' Men's Outerwear: Action Figures