He has been loaned to AC Milan during the American closed season to keep up his fitness and form so that he can continue to play for his country: England.

在美国职业联赛无赛期间，他还被租借到AC米兰，以此来保持他的体形，为他能继续为英格兰国家队效力养精蓄锐。

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Offer to help your parents keep the air filters on your ac and furnace clean.

帮助父母保持空调和暖气的空气过滤器的清洁。

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The AC Servo-System drive is used instead of the traditional CAM driving mode in order to realize pin-roller motor keep synchronization with the other motor.

采用交流伺服驱动代替传统的机械式的凸轮传动机构，实现针辊电机与其他电机的同步驱动。

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In addition to 300 hours of entertainment, ports for USBs MP3s, camcorders and cameras (and AC outlets to keep them all powered), Virgin Atlantic will also trial phone conversations on personal mobile phones later this year.

FORBES: Ready for On-Board Cell Phones?

Of course, leaving a smartphone's display on for multiple hours as you traverse Montana, Wyoming, Idaho, Oregon and California isn't wise without a power source to sustain that type of abuse, so it's worth mentioning that I traveled with an AC inverter in order to keep a constant power connection to the Lumia 900.

ENGADGET: Nokia Drive offline navigation review: taking the Lumia 900 for an off-the-grid spin