在大多数国家，口腔癌症发病率从每10万人口一例到10例不等。
Incidence of oral cancer ranges from one to 10 cases per 100 000 population in most countries.
图中是尼泊尔的一个小孩从一口被砷污染的水井中汲水喝，这种水会导致心率失常，血管损坏和癌症等其他疾病反应。
Here a child in Nepal drinks from a well containing water contaminated with arsenic, which can lead to abnormal heart beat, blood vessel damage and cancer, among other ill effects.
开始食用口嚼烟后，不过几年或几个月就有可能出现癌症前期的身体损害。
Spit tobacco can take its toll much faster than it hit me—precancerous lesions can appear in years or even months.
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