难得

It was a rare opportunity to rub shoulders with the rich and famous.

这是个与富翁名人来往的难得机会。

Once you have had rubella it is very rare to catch it again.

一旦你已感染德国麻疹，这是非常难得赶上一次。

The ancient world couldn't tell ruby and spinel apart, but spinel's role as an unknown understudy keeps its price relatively low today even though a one-carat red spinel is more rare than a one-carat ruby.

古代世界说不出红宝石、尖晶石遥远，但尖晶石作为未知understudy守信今天虽然价格较低一克拉是红色尖晶石更为难得一比一克拉红宝石。

If, however, the super-speculative investors run the show, the task of cooling the stock market is more difficult.

然而，如果是极度投机者主导市场，那么为市场降温的工作就会困难得多。

If it was much too easy to get loans in the salad days, it is much too difficult to get them in the locust years.

如果在光景好的时候，企业太容易得到贷款，那么在困难时期，它们就会太难得到贷款。

It is a scarce change in one's life.

这是一生难得的机会。

This is a scarce chance in life.

这是一生难得的机会。

This is a scarce opportunity in one's life.

这是一生难得的机会。

It is scarce for me to see her.

我难得看到她。

It's a scarce changce of all the life.

这是一生难得的机会。

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。