困难多的

Their difficulties are increasing.

他们的难来。

The times of chirospasm became more and more, my speaking became more and more lisping and swallowing also became the biggest difficulty.

手痉挛的次数来，话变得来含糊，吞咽成为最大的难。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组中酚类、黄酮类等次生代谢物，要从中提取出高纯度的DNA难。