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單字題The problem of subsidence in Taiwan is most serious in the southwestern area due to overuse of underground water there.由於過度使用地下水，台灣的地層下陷問題在西南地區最為嚴重。(A) typhoon (n.) 颱風(B) earthquake (n.) 地震(C) subsidence (n.) 沉澱；平靜；下陷(D) pollution (n.) 污染英文7000單字表：https://hiworldwelcome.blogspot.com/2021/12/7000.html