Other research in this area has required that cells of one type first be returned to a more generally undifferentiated stem cell state, which can introduce fresh problems.

该研究领域的其他技术都需要先将一种类型的细胞变回到普遍未经分化的干细胞状态，而干细胞才能发生分化。

youdao

Despite all these problems though, unemployment can be a chance for a fresh start.

尽管存在所有的这些问题，失业还是一个重新开始的机会。

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The memory of a fun weekend still fresh in the mind, returning to all the problems left behind on Friday and the endless expanse of time until next weekend.

愉快的周末还记忆犹新，却要回到在周五遗留下来的所有问题和到下个周末之前无尽的时间中去。

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But sod can also have problems, especially if it was not very fresh.

VOA: special.2009.07.07

Managing partner Steve Pettus says he has had no problems getting fresh seafood from his suppliers.

VOA: standard.2010.05.08

Sougarret said the drill hammer had been swapped out but hit fresh problems after running into rock that was tougher than expected.

CNN: STORY HIGHLIGHTS

Attempts to improve LIBOR and its equivalents bring fresh problems.

ECONOMIST: Interest rates

But Dennery says independence has brought with it a fresh set of problems.

CNN: Southern Sudan homecoming brings new problems