The sport's rules require that a race walker's knees stay straight through most of the leg swing and one foot remain in contact with the ground at all times.

这项运动的规则要求竞走运动员的膝盖在大部分的腿部摆动过程中保持笔直，一只脚始终与地面保持接触。

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Stay connected. Regular contact with friends and family not only enriches seniors' lives, it provides a safety net — people who care and will notice major mood changes.

保持联系。定期与朋友和家人保持联系不仅能够丰富老年人的生活，还能够提供一张安全网——人们会主要导照顾对象明显的情绪变化。

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The kids will reportedly stay with Angelina, but will have regular contact with Brad.

据报道子女将和茱莉在一起，但会定期和皮特保持联系。

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Partner organizations in the home countries stay in contact with the fellows throughout the program.

VOA: special.2009.09.24

Morgan Asset Management got an email on Thursday encouraging them to update their emergency contact information and to stay in contact with managers over the weekend.

WSJ: Wall Street Braces for a

And they do a remarkable job actually supporting us while we're in space to make sure that we can still speak with our families and that our families are informed and able to stay in contact with us.

WHITEHOUSE: President Obama's call to the International Space Station

"For me, the ideal use case for this product is the one where when you're out with a group of people whom you've recently met and want to stay in contact with, " that developer, Ryan Patterson, wrote.

CNN: Facebook pulls location-tracking feature