B2 [ I or T ] to change something, usually slightly, or to cause the characteristics of something to change(通常指轻微地)改动,修改;改变,(使)变化
[ T ] to change the size of clothes so that they fit better改动(衣服使其更合身)
More examples
Even a clear finish will alter the colour of wood slightly.
These are radical changes which will alter the complexion of the British contemporary dance scene.
You can alter the whole appearance of a room just by lighting it in a certain way.
Closing the factory would irrevocably alter the character of the local community for the worse.
Drugs can alter your perception of reality.
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