It's not that difficult to understand. 这很难理解吗
This is an incredibly difficult decision. 这很难决定
Must be enormously difficult to accommodate that inclination. 想必这样的需求满足起来难上加难吧
Perhaps her pale coat makes it difficult for the fish to see her 也许是因为白灵熊白色的皮毛
it's difficult to make yourself seen... 一切的踪迹
Hunting in a dense teak forest is difficult... 在茂密的柚木林中捕猎十分困难
and that makes protecting them difficult, too. 这也使得保护它们变得困难
After a difficult few weeks for Barbara and the research team... 芭芭拉以及整个研究团队度过了艰难的几周