“难以”的英语？

“难以”的拼音为：nán yǐ...

我们得到了通常难以获取的大量数据。We gained a rich supply of data which would normally be inaccessible.他经历的恐怖事件在他脑海中刻下了深深的，或许是难以磨灭的印记。The horrors he experienced are imprinted, perhaps indelibly, in his brain.我们需要的不是善意但难以实现的宣言，而是实际行动。What...