单干的英文：
break herd
go it alone
play a lone hand
plough a lonely furrow
pull a long oar

参考例句：

He decided to go it alone and start his own business.
他决定单干创业.

Fruit-tree with all its side branches cut off so that it grows as a single stem,usu against a wall or along wires
(剪去一切枝桠的)单干果树(通常倚墙或沿金属线生长).

That was her work -- typing. She did not type very quickly, and so she had to work alone, and not in a great office.
她的工作就是打字，她打字的速度不很快，所以她不能在一个大办事处里工作，只好一个人单干。

break是什么意思：
v. 打破；弄坏；兑开；违反；破解；使破产；突破；中断；削弱；突发；破晓
n. 破裂；中断，休息；骤变

to devastate; to break
使垮掉

Did you break your toy?
你弄坏你的玩具了吗？

break [lift, raise] a blockade
冲破 [解除] 封锁

herd是什么意思：
n. 兽群；牧群；群众；民众；一大批，大量；放牧人
v.（使）成群，聚在一起；放牧

That was the brute loyalty to the herd.
那是对群落的一种本能的忠诚。

They seemed part of herd, undistinguished.
他们似乎只是一群凡夫俗子。

You should not herd with the man as him.
你不应和他那样的人来往。

alone是什么意思：
adj. 单独的，独自的；只有，仅
adv. 单独地，独自地

He has a yen to be alone in a boat.
他渴望独自待在一条船上。

But many are unwilling to act alone.
但是许多人却不愿单独行事。

He is used to drinking alone.
他已经习惯了一个人喝酒。