Tus nqi lag luam methylene chloride hauv tebchaws tau poob qis, kev txaus siab rau kev khaws cia hauv khw tau zoo dua qub, cov tuam txhab hauv Shandong thiab lwm thaj chaw muaj kev xa khoom zoo, thiab tus nqi tau pom tseeb tias rov zoo. Ua ntej hnub so, cov tub lag luam npaj siab yuav npaj cov khoom ntawm tus nqi qis. Nag hmo, feem ntau cov tsev neeg loj tau txais ntau yam khoom. Txawm li cas los xij, qee tus tub lag luam hauv thaj chaw sab qab teb tau hais tias tseem muaj qhov ua tau ntawm nthwv dej tom ntej ntawm tus nqi qis ua ntej hnub so, thiab cov khoom raug ncua.

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