艰难但非常友好 Difficult But Very Friendly
但非常难
But it's very difficult
以上为机器翻译结果，长、整句建议使用 人工翻译 。
某地区煤系地层中普遍产出硫铁矿，但非常难选。
There commonly exist pyrite minerals in coal-bearing strata in one region, but it is difficult to separate.
youdao
那听起来很简单，但实际上非常难。
That sounds rather simple, but in fact it's very difficult.
《柯林斯英汉双解大词典》
但这段路却非常难走。
But it is very difficult to get there.
应用推荐
模块上移
模块下移
不移动