难得

The large and medium-sized cement enterprises in our country generally use high-quality bituminous coal and low quality coal can not been used.

随着优质资源的日益稀少，水泥工业逐渐向利用低质燃料的方向发展，但局限于当前的水泥生产工艺水平，能够适应水泥生产的煤种范围比较窄，一般我国水泥工业中的大中型企业多使用优质烟煤，劣质煤很难得到应用。

The Kid is shot for child, describing the love between a kid and his foster father. So I think the content of the song should have something to do with kids. R: I think this song is a cradlesong that you seldom wrote before. L: Yes. R: Really like blandish a baby to sleep, very comfortable and warm feeling.

小明星' 这部戏是给小孩子看的，讲述一个小孩与他的养父的一段感情，所以我想这支歌的内容要跟小孩子挂钩。R：我认为这支歌是你好难得写的一首象摇篮曲的作品。L：是的 R：真的象哄BABY睡觉，有一种很安适，温暖的感觉。

This is a chance once in a blue moon .

这可是一个难得的机会。。。

This is a chance in a blue moon.

这是个难得的机会。

This is a chance once in the blue moon.

这是个难得的机会。

This is a change once in a blue moon.

这可是个难得的机会。

Now a choice Brazilian Set for one guitar can command a hundred dollars or more: hardly a single board foot in volume.

现在一组经过精选可以作吉他用的玫瑰木，可以喊价到一百美金甚至更贵的价钱：但很难得体积超过一个板英呎。

Bole to immediately determine from the voice, which is a rare horse.

伯乐立即从声音中判断出，这是一匹难得的骏马。

Bole immediately determine from the voice, which is a rare horse.

伯乐立即从声音中判断出，这是一匹难得的骏马。

In these circumstances it is very hard indeed to build a "militant Bolshevik Party".

在这种情形下，"斗争的布尔什维克党"的建设，真是难得很。

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。