Some are tethered to ships, whereas others are cast free to operate like miniature submarines, although these too need the services of a support vessel.

有一些与船只绑定，另一些则如同微型潜水艇一样自由航行，但也是需要有供给船只服务的。

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Right now their core product is free, but in the future some additional optional services including development support and monetization opportunities will be added.

目前他们的核心产品是免费的，但是未来会增加一些附加可选的服务，其中包括开发支持，提供赚钱机会（monetization opportunities）。

youdao

While Linux Mint is available as a free download, the project generates revenue from donations, advertising and professional support services.

尽管Linux Mint是可以免费下载的，该项目的收入来自捐赠，广告及专业支持服务。

youdao

Smaller banks will either lose customer accounts to larger banks or lose revenue that is used to support free checking and other valuable services.

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In addition to the free rides, Nares' nonprofit provides support services and assistance to its clientele, many of whom do not speak English.

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Inside, they are greeted by a concierge-like Help Desk of about a dozen support personnel, whose services include occasional free hugs.

NEWYORKER: Happy Feet