难事的英文：
a piece of work
difficulty
nut
tickler

参考例句：

Paint the ceil was a tough nut to crack.
油漆天花板是件难事。

Painting the ceiling was a tough nut to crack.
油漆天花板是件难事。

Do not force me to handle these unusual affairs.
别逼我做这些难事。

A difficulty has cropped up at work.
工作中突然出了点难事。

Negotiation of the single-plank bridge was difficult for me.
要走过这座独木桥对我是件难事。

Now it isn't a piece of work to matriculate for us.
如今进大学读书并不是难事。

That's what made it so hard one autumn when difficult circumstances closed in on him.
有一年秋天他碰上了点儿难事，正是这些品质让他付出了很大的辛苦。

If she'll let up on some of the roughest things, I'll smoke private and cuss private, and crowd through or bust.
在些难事上，她要是能宽容一些，我就可以背地里抽烟、诅咒。 要么挺过去，要么完蛋拉倒。

"But if it turn out I am allergic to that cat, I'll have a hard time persuade my roommate to get rid of it. "
但假如结果发现我对那只猫过敏，我要说服我的同屋把猫处理掉可是件难事。

piece是什么意思：
n. 片，段；件，个；篇；硬币
v. 修补；填补；拼凑，缝合
adj. 计件的

a piece of flesh
娘儿们|女人|人

A piece of cake
小事一桩

Then It'started to break into pieces. These pieces started to move apart.
然后它开始分为很多块。这些分开的板块开始移动，分开。

work是什么意思：
n. 工作；职业；工厂；工作地点；产品；功；操作；作品；工程
v.（使）工作；操作；运作；起作用；使缓慢前进；经营

the works of a clock
钟的活动部件

conscientious work
本着良心做的工作

The work is not advancing.
工作没有进展。

difficulty是什么意思：
n. 困难，艰难；难点，难事，困境；异议，反对，争论

I appreciate your difficulties.
我理解你的困难。

No difficulty can overwhelm us.
困难压不倒我们。

Inevitably, the proposal is running into difficulties.
提案意料之中地遭遇了麻烦。