换药时的英文：
at dressing change

dressing是什么意思：
n. 调味品；穿衣；装饰；敷料
v. dress的现在分词

"Dress right! Right,dress!"
“向右看齐! ”

She appeared at the door dressed in a coffee dressing gown.
她穿了一件咖啡色的绸缎睡衣出现在门口。

French dressing salad dressing of seasoned oil and vinegar
油和醋调成的色拉调料.

It's better to dress up than dress down.
打扮比不打扮要好。

To be well dressed doesn't mean to be luxuriously dressed
穿得好不一定衣着豪华。

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。