要达到50级以上是十分困难。
说了多少爱你，也不级遇到困难，你说的一句别怕，有我。
How much love you, is not encountered difficulties, you say I have a fear.
尽管有这些困难，他还是给升入了四年级。
Despite these difficulties, he was promoted to the fourth grade.
低同源蛋白质的二级结构预测至今仍然是一个困难的问题。
Prediction of lowly homological protein secondary structure is still a difficult problem up to now.
低同源蛋白质的二级结构预测至今仍然是一个困难的问题。
Prediction of lowly homological protein secondary structure is still a difficult problem up to now.
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