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The teachers training work has no system, the research level is low;
师资培训工作无制度，科研水平低；
youdao
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Then, he said, the hardest work was done by the low-level labourers.
然后他说，底层的工人已经做完了最艰难的工作。
youdao
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Then, he said, the hardest work was done by the low-level labourers.
然后他说，底层的工人已经做完了最艰难的工作。
youdao