难得

Cacti are often thought of as a stereotypical desert plant, but they are rarely the dominant species in an area of desert.

仙人掌是经常看作一种固有的沙漠植物，但是它们是难得的主要角色物种在沙漠地区。

I have rarely seen her display any sign of emotion.

我难得见到她将喜怒形於色。

I have rarely seen her display any sign of emotion.

我难得见到她将喜怒形于色。

At high altitudes it is difficult to get enough oxygen.

在海拔高的地方很难得到足够的氧气。

For a luscious break from August temperatures that average 29oC, a young herder does refreshing backflips off water buffalo taking their daily bath in the Turag River just west of Dhaka.

这一天平均温度为29摄氏度，是八月里难得凉爽的一天，在达卡以西的Turag河，一位年轻的牧人来了一个清爽的后空翻，落入水中，周围的水牛正在进行每日一次的沐浴。

For a luscious break from August temperatures that average 29oC, a young herder does refreshing backflips off water buffalo taking their daily bath in the Turag River just west of Dhaka.

这一天平均温度为29摄氏度，是八月里难得凉爽的一天，在达卡以西的图拉格河，一位年轻的牧人来了一个清爽的后空翻，落入水中，周围的水牛正在进行每日一次的沐浴。

For a luscious break from August temperatures that average 84°F (28.9°C), a young herder does refreshing backflips off water buffalo taking their daily bath in the Turag River just west of Dhaka.

自八月以来难得凉爽的一天，这天平均气温为84华氏度（28.9摄氏度），水牛在达卡以西的杜拉格河进行每天沐浴时，一名年轻的牧人借一头水牛之背来了个清爽的后空翻。

It is also a best opportunity for Chinese professional bartenders to have a face-to-face interaction with them.

这将是一堂聚集全中国最顶级调酒师的难得机会，并能与最资深的大师们面对面的交流。

Bull terriers and Beardies are two species of rare exotic creatures.

牛市猎犬和beardies是两个物种难得的异国情调的动物。

There were no bugs, and we had bedsteads and straw palliasses, rare luxuries both.

不过这里没有臭虫，而且居然还有个床架和草垫，这可都是难得一遇的奢华。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。