/ˈek.ses/
[only before noun] in addition to an amount that is necessary, usual or legal 超额的；额外的；附加的；过度的
Excess food is stored as fat.
多余的食物作为脂肪贮存起来。
Driving with excess alcohol in the blood is a serious offence.
血液里酒精含量过高时驾车是严重的违法行为。
excessive
/ekˈses.ɪv/
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too much:
Excessive exercise can sometimes cause health problems.
Any more pudding would simply be excessive.