The second within-subject factor is difficulty, included three levels, easy, medium and difficult.

第二个因素是被试内变量，即阅读材料的难度，分为容易、中等、难三个水平。

youdao

And the more difficult question is about the meaning of life or the meaning of death, which have the same kind of medium importance.

并且更困难的问题是，关于生命的意义或是，死亡的意义，这两者同样重要。

youdao

Finding a happy medium is tedious and difficult.

想要为此找到一个折中的解决之道是乏味和困难的。

youdao

It is an example worth emulating for curators of architecture exhibitions and of drawings alike: The combination of a difficult medium and subject makes such contextual materials doubly necessary.

WSJ: Masterpieces on a Shopping List | Michelangelo Master Drawings | Museum of Fine Arts Boston | By Cammy Brothers

He explained NIE's short, medium and long term plans but said it would be difficult to get beyond the medium term targets without further infrastructure in the west.

BBC: Enterprise Committee

The current dehydration has made it extremely difficult for small and medium-size businesses to get needed loans.

FORBES: AMERICA'S AMAZING MILITARY