The Volvo XC60 is the only model of the three to offer optional rear integrated child booster seats.

沃尔沃XC60的是三个唯一的模式，以提供可选的后方综合儿童助推器席位。

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The firm plans to offer optional solar-photoelectric systems, to be set up as a car port at home, that will be able to power the cars for 80km a day without having to draw on the grid.

公司计划提供光电转能系统，即未来的太阳能车房能实现电驱车不必从电网取电一天跑80公里了。

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To help enhance safety, products offer optional finger-safe, see-through covers, an Ingress Protection 20-rating that includes lockout/tag out capabilities and open circuit indication.

为了帮助提高安全性，产品提供可选的手指安全，可透视的盖子，以及包含锁定/ 标签能力和开路指示功能的20等级的防尘防水保护。

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All of these apps offer optional alerts for major weather events, such as approaching rainstorms.

BBC: The best weather apps for travellers

Range Rover will also offer optional executive seating, with two business-class seats in the place of the midrow bench.

WSJ: 2013 Range Rover Review: If You Must Buy a Luxury SUV... | Rumble Seat

Saying that gamers want flexibility in how and where they play, Razer will offer optional accessories to allow players to customize their gaming experiences through hardware attachments.

CNN: At CES, Razer rolls out tablet for hard-core gamers