你一旦染上了坏习惯，就很难除掉。
Once you get into bad habits, you can not get rid of it easily.
一个人一旦染上恰加斯病，这种感染可能潜伏数十年。
Once a person has contracted Chagas disease, the infection may remain dormant for decades.
悲伤似毒，一旦染上，就戒不掉，心瘾永远戒不掉。
Sad like drugs, once contracted, it addictive, mind forever addictive addiction.
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