You have to register and pay by the hour.

你必须按小时登记和付款。

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How long you want to rent it? You can pay by the hour or pay by the day.

你要租多久呢？你可以按小时付费，也可以按天付费。

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For those of us who pay by the hour for Internet service, unwanted attachments can be quite costly and time-consuming.

对于我们这些按小时支付网费的人来说，多余的附件可能是相当耗费时间和金钱的。

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Purchase a temporary membership at any Hubway kiosk, pay by the half hour to use the bike (free under 30 minutes) and return the bike to a kiosk close to your destination.

BBC: In Boston, leaf peeping by bike

Companies that use an outcome-based approach pay for results, not by the hour.

FORBES: An Opportunity For The CIO

The European Union, by contrast, forbids employers to pay less per hour for the same work when it is done part time than when it is done full time.

CNN: Why is 'having it all' just a women's issue?