... explain a difficult problem解释难题 explain a foreign passage解释这段外文 explain a plan说明计划 ...
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explain a difficult problem
解释一个难题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
She began to explain to the students how to solve a very difficult problem.
VOA: special.2009.10.25
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