A lavalier microphone is made for hands-free operation.

领夹式麦克风可免提操作。

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Maintenance free operation, no need to add water, no equalizing charge required.

设计简洁，免维护，无需补水，不需均衡充电。

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Sensor feedback of all device handling for trouble-free operation and maximum uptime.

所有器件操作传感器反馈，无故障操作，最大正常运行时间。

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The rescue operation to free him, approved at the highest levels of the British government, is being criticized in both Kabul and London amid reports that the captives were close to being freed through negotiations.

VOA: standard.2009.09.10

The second principle is did the distribution arise from the operation of free consent, people buying and trading on the market?

第二条原则，财富的分配是否,基于自由达成的交易，基于自由市场的买卖？

耶鲁公开课 - 公正课程节选

Magellan connects the smartphone to the vehicle dashboard, enabling location sync and sharing, hands-free operation and data connectivity.

ENGADGET: Magellan's smartGPS navigator has built-in Yelp reviews, syncs with your phone (video)

Offered with either a manual cloth top or power retractable hardtop, we prefer the former for simpler and glitch-free operation.

FORBES: Mazda MX-5 Miata

"The breakthrough UI defines a new language for human-device interaction that is built ground-up for eye-free operation, " said Boaz Zilberman, chief executive officer of Project RAY.

ENGADGET: Qualcomm develops eyes-free smartphone for the blind and visually impaired, calls it Ray