it is a rarity的意思|示意

With the conversation scope in the picture, the need for the session scope is a rarity, and you can use it more deliberately.

借助conversation作用域，几乎不再需要使用会话作用域，并且您可以更为随意地使用。

Rarity is not merely determined by the number of individuals in a species, it is also about how unusual that species is.

稀缺性不仅仅由某个物种所包含的个体数量决定，还和物种的数量有关。

The same point is made by Stephane March in his book French Blues, a study of the Gallic condition. it is a very funny book, which is itself a rarity in French writing.

斯蒂芬·马奇在他的一本研究高卢人状况的书《法国的忧郁》(一本很有趣的书，本身就是法国作品中的奇葩)中也指出了这一点。

This is not a new suggestion, but brain cancer is rare, and its rarity makes it hard to study systematically.

这个提议并不新鲜，但脑癌是罕见的，这使做系统研究变得很难。

In fact, it is off a road that slices through the West Bank but, unlike several such arterial routes, it is one where Palestinians and Israelis can consort with each other—which is quite a rarity.

事实上，那里已经远离穿越约旦河西岸的公路了，但与其他交通要道不同，那却是十分罕见的巴以居民能够自由往来之地。

It is something of a rarity. If this were a bird, the queues would be stretching round the car park.

它是一些罕见的事情，如果这是一只鸟，人龙会伸展至围绕停车场。