Mr Brown is a dustman while his wife is a professor.是什么意思？

Mr Brown is a dustman while his wife is a professor.

布朗先生是位清洁工而他的妻了是一位教授.

Mr

abbr. Mister 先生，Master 少爷，Mother 母亲，molecular radius 分子半径；

例句
According to police accounts, Mr and Mrs Hunt were found dead on the floor of their kitchen.
据警方称，亨特夫妇被发现死在家里厨房的地板上。

brown

adj. 棕色的，褐色的，被晒黑的，未去壳的；n. 褐色，棕色；v. 变成棕色，成褐色，晒黑，烤得焦黄；

例句
He had a thin aquiline nose and deep-set brown eyes.
他长着窄长的鹰钩鼻和深陷的褐色眼睛。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

dustman

n. 清洁工；

例句
Mr Brown is a dustman while his wife is a professor.
布朗先生是位清洁工而他的妻了是一位教授.

while

conj. 在…期间，与…同时，虽然，

例句
A Dr Matthew Owens was reported missing while on an expedition to north-eastern Turkey.
据报道，一位叫马修·欧文斯的博士在前往土耳其东北部考察的途中失踪了。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

wife

n. 妻子，太太，夫人，老婆，已婚妇女；

例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。

professor

n. 教授，（大学的）讲师，教员，自称者，宣称者；

例句
...a young assistant professor at Harvard.
年轻的哈佛助理教授