On the main line to seize materials, focused and distracted and difficult to arrange for an orderly;

对教材抓住了主线、重点突出、分散了难点、安排有序；

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Because the engine is in the front of the tractor, so reverse-six-link mechanism used for traditional loaders is difficult to arrange.

由于拖拉机的发动机前置，使得传统装载机上应用的反转六连杆机构在拖拉机上难于布置。

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If you're allocating native resources (memory on the native heap, file descriptors, or whatever), it can be significantly more difficult to arrange timely collection of these resources.

如果你分配了native资源，及时回收这些资源是很困难的。

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Such variety might be difficult to arrange in London, New York, Silicon Valley, or Mumbai.

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But such coordination would not be difficult to arrange, nor would it require a mandate or any significant funding.

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However, previous attempts to use nanotubes in the solar cell construction process have been difficult because its difficult to arrange the nanotubes on the cell without clumping.

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