改道的英文：
change its course; change one's route

参考例句：

The diversion of a stream,one's thoughts
河流的改道、思想的转变

The trucks were forced to divert to another road.
卡车被迫改道而行。

We must divert the river from its course
我们必须使这条河改道。

They diverted the river to supply water to the town.
他们使河流改道以便向城市供水。

When the car crashed, the police diverted the traffic.
当那辆车撞坏时，警察就让车辆改道。

We turned off the motorway at exit31.
我们在31号出口改道离开高速公路。

Sorry I'm late there was a diversion.
对不起,我迟到了--因为改道的缘故.

They diverted the river to supply water somewhere else.
他们使河水改道以供应别处的用水。

All traffic has to take a diversion and rejoin the motorway 10 - km further on.
所有的车辆都必须改道而行，可在前方20公里处，重新回到机动车道上。

change是什么意思：
n. 变化；交换，交替；零钱
v. 改变；交换，替换；兑换；更换

change a bed;change the baby.
换床单；给婴儿换尿布

We propose 'a change [making a change / to make a change / that a change should be made].
我们建议应做一点改变。

The change of quantity can causes the change of quality.
量变可以引发质变。

its是什么意思：
pron. 它的

The noes have it.
投反对票者占多数.

There is no percentage in it.
没有赚头。

The ayes have it.
赞成者占多数。

course是什么意思：
n. 过程；课程；方针；系列

a bobsleigh course
大雪橇滑道

It is not, of course, exhaustive
当然这是不够详尽的。

In college, English is a required course and psychology is an elective course.
在大学里，英语是必修课而心理学是选修课。