B1 to become less, or to make something become less(使)减少;(使)下降;(使)降低
More examples
During the 1980s, the amount of ozone in the stratosphere above Europe decreased by about 8%.
Total unemployment has decreased in the past year.
The pop star's popularity decreased as he got older, which is only to be expected.
The government proposed decreasing the annual expenditure on arms.
To make the sleeve get narrower toward the cuff, you gradually decrease the number of stitches on your needle.
B1 a reduction减少;下降;降低
More examples
There was a slight decrease in his weight after a week of dieting.
Any decrease in tourism could have a serious effect on the local economy.
The report's finding on the decrease in violent crime supports the police chief's claims.
We have seen a marked decrease in the number of accidents since these safety measures were introduced.
We've noticed a steady decrease in jobs available for new graduates in the industry.
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