A bad habit once contracted takes a very long time to uproot (or root up).

坏习惯一旦养成，需要很长的时间才能根除。

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Sad like drugs, once contracted, it addictive, mind forever addictive addiction.

悲伤似毒，一旦染上，就戒不掉，心瘾永远戒不掉。

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Once a person has contracted Chagas disease, the infection may remain dormant for decades.

一个人一旦染上恰加斯病，这种感染可能潜伏数十年。

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Revenues efficiency, a measure of performance of the rig once it is contracted also improved from around 90.5% in 2011 to around 93%.

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The day center's director, Alethea Wright, had contracted to use the club once a week.

CNN: Swim club accused of racial discrimination against kids