艰巨

Obviously, recruiting voluntary bone marrow donors in mainland China is ___.

C。分析：根据搭配含义（很明显，中国的大陆招募骨髓移植自愿者是一项紧迫而艰巨的任务）判断C合适。

We are casting about how to break the back of the work.

我们正在考虑怎样完成这件工作的最艰巨部分。

Only a few years ago the free weight area was a breeding ground for modern day Herculean men .

仅在几年前的自由重量区的滋生地，为现代天艰巨的男子。

Bribery is one of the most serious social problems in China and Japan.

贿赂犯罪是中日两国较严重的社会问题，也是两国刑法所面临的艰巨任务之一。

It was a difficult task , but we bring it off.

任务艰巨，但是我们圆满完成了。

In building a well-to-do society, the bringing-up ratio is overestimated or underestimated by the analysis on the ratio due to the different population policy under the condition of increasing aging population, the under-construction of social guarantee system, and the arduous task of population control.

基于我国人口老龄化逐渐加重，社会全民保障体系尚未建立与完善，人口控制任务依然艰巨的情形下，通过指出在抚养比的计算中存在的问题，以及比较分析不同人口政策的抚养比，借以阐述我国的抚养比存在失真，即存在"高估"或"低估"现象。

Throw in the bulkiness of a down comforter, and it became quite the daunting task, but they managed.

扔在bulkiness一个下跌的慰藉，成为相当艰巨的任务，但他们的管理。

The most arduous cajolery: i determine to love u for a million years.

最艰巨的甜言蜜语——我决定爱你一万年

It's a difficult job but she's the person to carry it through.

这是一项艰巨的工作，但她这个人是能够顺利完成的。

Historical documents on music are a great challenge for scholars to collect and categorise .

音乐史料的收集与整理对于音乐史学研究者是一个复杂而又艰巨的工作。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。