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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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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Once the requestor (or client) has contracted (or registered) with the provider, that requestor is said to be known to the provider and to the service meter.

一旦请求者(或客户方)与提供者签订了合同(或进行了注册)，请求者就为提供者和服务计量所知了。

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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.

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