难得

This is the C language university courseware, it is difficult to get.

这是清华大学的C语言教学课件，很难得的。

However, measurement noises from different sensors are generally correlated with covariance matrix which is difficult to be determined accurately.

但各传感器测量噪声会出现相关的情况，而且很难得到相关测量噪声的方差矩阵的精确值，测量系统往往是不确定的。

"They hardly ever stand still," he said, but for one moment Wendy saw the romantic figure come to rest on the cuckoo clock.

"她们仙子难得停住。"彼得说。可是，有一刹那温迪看见那个神奇的小人儿落在了一座杜鹃钟上。

Beside this I got a rare mess of golden and silver and bright cupreous fishes, which looked like a string of jewels.

此外，我居然捕到了很难得的一堆金色银色闪闪发光的杯形鱼，看来很像一串宝石。

During Mr. Thondup's rare breaks at home, the family went on picnics in the misty hills of Darjeeling.

难得空闲时，一家人会到大吉岭雾气笼罩的山中去野餐。

I firmly believe that no difficulties will daunt the brave Chinese people!

我坚信，没有任何困能难得倒英雄的中国人民！

There is nothing dearer than the life we share.

什么也没有我们共享的生存难得。

I never went out a fishing or shooting; a book, indeed, sometimes debauched me from my work, but that was seldom, was private, and gave no scandal; and, to show that I was not above my business, I sometimes brought home the paper I purchased at the stores through the streets on a wheelbarrow.

我从不从事钓鱼和打鸟的活动；真的，有时只有一本书打扰我的工作，但那也是难得的，并且很适当，也不会受议论；而且为表示我没有看不起我的职业，有时我把店中购办的纸张装在手推车上，直接穿过街道，推回家中。

You may not know, bored, decadent for me is how rare.

你也许不知道，无聊、颓废对于我来说是多么的难得。

Mr. may rest on the deck chair, enjoy rarely take vacation the feeling.

大人们可以在躺椅上休息，享受难得的度假感觉

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。