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ar un y llaw
on one hand
最后更新: 2021-01-21
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un y pen yn ddigon
one is never enough
最后更新: 2021-04-18
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mae cynhyrchu unrhyw beth tra gwenwynig fel deuocsinau , deubensoffiwranau a chemegolion eraill ar gyfradd o un y biliwn yn fater pwysig
the generation of any ultra toxin such as dioxins , dibenzofurans and other chemicals at the rate of one per billion is an important matter