本期内容：

A collection of plastic afloat in the Pacific Ocean is growing rapidly, according to a new scientific estimate. Predictions suggest a build-up of about 80,000 tonnes of plastic in the "Great Pacific Garbage Patch" between California and Hawaii. This figure is up to sixteen times higher than previously reported, say international researchers.

afloat：漂浮
estimate：估测
build-up：堆积

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