评论
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1.They believe people eat up to 11,000 pieces of plastic in their food each year.
up to多达
I can take up to four people in my car.
我的车能载 4 个人。
2.Sixty pieces of microplastic may not seem a lot but it will build up over time.
build up（使）积聚；（使）逐渐增加
Deposits of plaque build up between the tooth and the gum.
牙齿和牙龈之间会滋生牙斑。
