改换的英文：
change; change over to

参考例句：

Change gate location to after flow pattern
改换浇口位置活动模

It would be too expensive to alter existing lighting.
要改换现有的照明设备花费太大。

I wouldn't suggest changing the timetable without any particular reason.
我劝你没有特殊原因不要改换时间表。

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。

Changing the rate of cylinder rotation changes the speed selected.
改变圆筒旋转速率就改变被筛选的速率。

Inflammatory changes appear secondary to biochemical changes
炎症变化似乎是继发于生物化学的变化。

over是什么意思：
adv. （倒）下；从一边到另一边；越过；再；结束
prep. 在…之上；越过；在…的另一边（对面）；由于；从一边到另一边
adj. 过去的；结束的；外面的；上面的
v. 越过

chew over; think over
考虑;详细讨论

I have failed over and over and over again in my life.
我一生中失败了一次又一次。

"Over shoes, over Boots"
一不做,二不休

The police replayed footage of the accident over and over again.
警察一遍又一遍地重放事故的片段。

Have you run into the same type of boss over and over again?
你不断地跳槽，换了东家换西家，却发现你所面对的老板都一个样。