Our present work in Iraq and Afghanistan is difficult. It is also historic and essential.
我们目前在伊拉克和阿富汗展开的工作是艰巨的，同时也是具有历史意义和必要的。
Part II: the historic development and present conditions of the teaching practice institution in China.
第二部分：中国教育实习制度的历史演进与现状。
The cause to form it is very complex, of both historic and real present.
该现象形成的原因较为复杂，既有历史原因，也有现实原因。
The cause to form it is very complex, of both historic and real present.
该现象形成的原因较为复杂，既有历史原因，也有现实原因。
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